Heat Pump Maintenance: 12 Essential Tasks for BC Homes

How Often Does a Heat Pump Need Maintenance?

Homeowners should inspect filters and visible equipment regularly throughout the heating and cooling seasons. A professional heat pump inspection is generally recommended once a year, preferably before the period of highest heating or cooling demand.

A practical schedule may include:

• Monthly during heavy use: Check filters, indoor airflow, outdoor-unit clearance and visible warning signs.
• Every one to three months: Clean or replace filters as required by the manufacturer and home conditions.
• Seasonally: Inspect the outdoor unit, drainage, registers, return grilles and thermostat operation.
• Annually: Arrange professional inspection, cleaning, electrical testing, airflow verification and performance testing.
• Immediately: Request service when the system shows a fault, repeatedly trips a breaker, remains heavily iced or cannot maintain temperature.

Homes with pets, renovations, smoke, high dust levels or continuous equipment operation may require more frequent filter and coil attention.

The equipment manual should remain the primary reference for the installed model.

Heat Pump Maintenance Schedule

Maintenance frequency is affected by equipment type, operating hours, indoor air quality, outdoor exposure and manufacturer requirements.

Task 1: Clean or Replace Heat Pump Filters

Dirty filters are among the most common causes of restricted heat pump airflow.

A filter collects dust and airborne particles before they reach the indoor coil, blower and occupied rooms. As material builds up, pressure drop increases and the system has to work harder to move air.

Restricted airflow may contribute to:

• Reduced heating or cooling capacity
• Longer operating cycles
• Higher energy consumption
• Airflow noise
• Indoor coil freezing during cooling
• High indoor temperatures during heating
• Equipment faults
• Increased blower stress

Central Ducted Filters

A central heat pump may use:

• A one-inch disposable filter
• A larger media filter
• A washable filter
• An electronic air cleaner
• A filtration accessory connected to the return duct

Check the filter monthly during periods of regular operation. Replace or clean it when loaded, according to the manufacturer’s instructions.

Do not install a filter with substantially higher resistance without confirming that the blower and duct system can support it. A more restrictive filter can reduce airflow even when it appears clean.

Ductless Mini-Split Filters

Most wall-mounted ductless indoor units use reusable mesh filters.

A typical cleaning process may include:

1. Turn the indoor unit off.
2. Open the front cover according to the manual.
3. Remove the filters carefully.
4. Vacuum loose dust or rinse the filters if permitted.
5. Allow washed filters to dry completely.
6. Reinstall the filters in the correct position.
7. Reset the filter reminder if applicable.

Do not operate the indoor unit without its filters unless the manufacturer specifically permits it.

Filters Do Not Replace Internal Cleaning

Clean filters reduce contamination, but dust can still collect on the indoor coil, drain pan and blower wheel.

If the indoor unit smells musty, becomes noisy or delivers less airflow despite clean filters, internal professional cleaning may be needed.

Task 2: Keep Indoor Airflow Paths Clear

Heat pumps depend on continuous airflow across the indoor coil and through the occupied space.

For Ducted Systems

Keep the following components unobstructed:

• Supply registers
• Return-air grilles
• Mechanical-room access
• Filter cabinet
• Thermostat

Furniture, rugs, curtains and storage boxes should not block supply or return openings.

Closing too many supply registers can increase duct pressure and reduce total airflow. It usually does not create useful energy savings.

For Ductless Systems

Keep the area around each indoor unit clear.

Avoid placing tall furniture, shelving or curtains directly below or in front of the air discharge.

The indoor unit also needs room for:

• Air intake
• Filter removal
• Front-cover opening
• Drain service
• Coil and blower cleaning

Adjust the louvers so air reaches the occupied space without blowing continuously on beds, sofas or work areas.

Task 3: Inspect the Outdoor Heat Pump Unit

The outdoor unit needs open airflow through the coil and unrestricted discharge from the fan.

Inspect the area regularly for:

• Leaves
• Grass clippings
• Plastic bags
• Vegetation
• Snow
• Roof runoff
• Loose insulation
• Stored items
• Pet hair
• Construction dust

Maintain the clearances stated in the manufacturer’s installation manual.

Outdoor Unit Placement Problems

Maintenance may reveal installation issues such as:

• The unit is too close to a wall or fence
• Vegetation has grown into the coil
• Roof water drains onto the equipment
• The unit has settled out of level
• The mounting bracket is loose
• Defrost water cannot drain away
• Service panels cannot be removed safely

Do not permanently cover the outdoor unit. It must exchange heat with outdoor air throughout heating and cooling operation.

After Landscaping or Construction

Check the outdoor coil after:

• Lawn cutting
• Pressure washing nearby surfaces
• Exterior painting
• Drywall or renovation work
• Roof replacement
• Fence construction

Fine debris can block coil surfaces even when the equipment appears clear from a distance.

Task 4: Keep the Outdoor Coil Clean

The outdoor coil absorbs heat during winter and releases heat during summer. Dirt on the coil reduces the amount of air that can pass through it.

A restricted outdoor coil may cause:

• Reduced efficiency
• Lower heating or cooling capacity
• Longer run times
• Higher operating pressures
• More frequent faults
• Increased compressor stress

Homeowners can remove loose debris from the surrounding area without opening the cabinet.

Professional coil cleaning may require:

• Removing equipment panels
• Protecting electrical components
• Using an approved cleaning method
• Cleaning from the correct direction
• Straightening damaged fins where practical
• Confirming drainage after cleaning

Do not use sharp tools to remove dirt or ice. The coil contains thin metal fins and refrigerant tubing that can be damaged.

High-pressure cleaning can bend fins or push water into electrical components. Coil cleaning should follow the equipment manufacturer’s instructions.

Task 5: Check Condensate Drainage

During cooling and dehumidification, moisture from indoor air collects on the cold indoor coil.

The water flows into a drain pan and exits through a condensate drain or pump.

A blocked or damaged condensate system may cause:

• Water leaking from the indoor unit
• Ceiling or wall damage
• Musty odours
• Drain-pan overflow
• Equipment shutdown
• Higher indoor humidity
• Microbial growth

Ducted System Drainage

Central equipment may include:

• A primary drain pan
• A secondary or emergency drain pan
• A gravity drain
• A condensate pump
• A float safety switch

During cooling operation, check for unexplained water around the air handler, furnace, floor drain or ceiling below the equipment.

Ductless System Drainage

Each ductless indoor unit has its own condensate route.

Drainage problems may result from:

• A blocked drain hose
• Incorrect slope
• A disconnected drain
• A failed condensate pump
• Contamination in the drain pan
• Improperly insulated piping

Water dripping from the front or bottom of an indoor unit is not normal and should be inspected.

Task 6: Monitor Defrost Operation and Winter Ice

During heating mode, frost can form on the outdoor coil. The heat pump periodically enters defrost mode to melt that frost.

Normal defrost observations may include:

• The outdoor fan stopping temporarily
• A change in compressor sound
• Steam rising from the outdoor unit
• Water draining below the equipment
• A temporary change in indoor supply-air temperature

A thin layer of frost before a defrost cycle can be normal.

Abnormal Winter Ice

Request service when:

• The coil remains covered in heavy ice
• Ice surrounds the fan or cabinet
• The unit repeatedly enters defrost
• The outdoor fan does not restart
• Water freezes around the base and blocks drainage
• Ice creates a walkway hazard
• The home loses heat during repeated defrost operation

Heavy icing may be connected to airflow, drainage, sensors, controls, refrigerant charge or outdoor-unit placement.

Do not chip ice from the coil with a screwdriver, knife or other tool. The resulting repair is generally more expensive than the frost problem that inspired it.

Defrost Water Management

The outdoor unit should be mounted high enough and positioned so defrost water can drain without refreezing against the coil, foundation or walkway.

Lower Mainland winters are often cool and damp, which can create significant defrost water even when snowfall is limited.

Task 7: Check Thermostat and Control Operation

A thermostat or communicating control determines how the heat pump responds to indoor and outdoor conditions.

Confirm that:

• The system is set to Heat during winter
• The system is set to Cool during summer
• The fan is set according to the equipment instructions
• The displayed indoor temperature is reasonable
• Schedules are intentional
• Backup heat is not being forced unnecessarily
• Emergency Heat is not selected by mistake
• Error messages are investigated

Use Stable Temperature Settings

Heat pumps often operate efficiently with steady indoor settings.

Large temperature setbacks may cause:

• Long recovery periods
• Higher compressor output
• Electric auxiliary heat operation
• Early furnace operation in a dual-fuel system

A small setback may be appropriate for some systems, but operation should follow the manufacturer and control strategy.

Avoid Automatic Heating and Cooling Changeover When Unnecessary

Automatic mode may switch between heating and cooling during unusual spring or fall conditions.

Using a dedicated heating or cooling mode generally provides clearer operation unless automatic changeover is required for the building.

Thermostat Location

The thermostat should not be affected by:

• Direct sunlight
• Supply-air discharge
• Kitchen heat
• Exterior-door drafts
• Fireplaces
• Electronic equipment

An unsuitable thermostat location can make a correctly operating system appear unstable.

Task 8: Inspect Ductwork and Verify Airflow

Central heat pump maintenance should include attention to the distribution system, not only the equipment cabinet.

Duct problems may include:

• Disconnected sections
• Leaking joints
• Crushed flexible duct
• Damaged insulation
• Restricted return air
• Closed dampers
• Dirty grilles
• Oversized or restrictive filters

Signs of Airflow Problems

• Whistling at return grilles
• Very weak airflow from some registers
• Excessive airflow noise
• Large temperature differences between rooms
• Indoor coil freezing
• Repeated high-pressure or low-temperature faults
• Blower running at unusually high speed

Professional Airflow Measurements

A technician may measure:

• Total external static pressure
• Pressure drop across the filter
• Pressure drop across the indoor coil
• Blower speed and airflow
• Supply and return temperatures
• Room or branch airflow where required

Cleaning the outdoor unit will not correct a restricted return duct. Maintenance should consider the complete system.

Task 9: Test Refrigerant-System Performance

A heat pump is a sealed refrigeration system. Refrigerant should not be consumed during normal operation.

A low refrigerant charge usually indicates:

• A leak
• Incorrect installation charge
• Improper commissioning
• Previous incomplete repair

Adding refrigerant without identifying and addressing the cause may provide only temporary improvement.

Possible Refrigerant Problem Symptoms

• Reduced heating or cooling capacity
• Indoor coil freezing
• Abnormal compressor sound
• Long operating cycles
• Repeated error codes
• High energy use
• Unusual pipe temperatures
• Oil residue around refrigerant connections

Professional Refrigeration Checks

Depending on the system and conditions, a technician may:

• Inspect refrigerant piping and flare connections
• Check operating pressures and temperatures
• Measure superheat or subcooling where applicable
• Review electronic service data
• Check compressor current
• Compare performance with manufacturer specifications
• Perform leak detection when evidence supports it
• Repair and pressure-test a confirmed leak
• Evacuate and recharge the system correctly

Refrigerant diagnosis should be based on measurements, not the assumption that every weak heat pump “needs gas.”

Task 10: Inspect Electrical Components

Heat pumps contain high-voltage circuits, control wiring, circuit boards, relays, contactors, motors, sensors and compressor components.

Professional electrical inspection may include:

• Disconnect condition
• Breaker size
• Wire and terminal condition
• Voltage
• Operating current
• Contactor condition
• Capacitors where used
• Grounding and bonding
• Control wiring
• Communication wiring
• Signs of heat damage
• Moisture inside electrical compartments

Warning Signs of Electrical Problems

• Repeated breaker trips
• Burning smell
• Buzzing or arcing sound
• Discoloured terminals
• Intermittent startup
• Display or communication faults
• Outdoor unit completely unresponsive

Do not repeatedly reset a tripped breaker. A breaker trip can indicate an electrical fault, failed motor, compressor problem, damaged wiring or unsuitable circuit condition.

Electrical panels and heat pump cabinets should only be opened by qualified personnel.

Task 11: Inspect Indoor Blowers and Outdoor Fans

Fans move air through the indoor and outdoor heat exchangers.

Dirt, bearing wear, damaged blades or incorrect speed settings can reduce performance.

Indoor Blower Inspection

A technician may check:

• Blower-wheel cleanliness
• Motor current
• Motor bearings
• Speed settings
• Control signals
• Wheel balance
• Cabinet vibration
• Airflow against manufacturer specifications

Ductless blower wheels can accumulate dust beyond the visible filter. This may reduce airflow and produce streaks of dirt on the louvers or wall.

Outdoor Fan Inspection

The outdoor fan should operate smoothly without repeated impact, grinding or severe vibration.

Possible problems include:

• Damaged blades
• Loose mounting hardware
• Motor bearing wear
• Ice interference
• Control failure
• Debris inside the cabinet

The outdoor fan may stop temporarily during a normal defrost cycle. It should resume operation when the cycle ends.

Task 12: Schedule Professional Heat Pump Maintenance

A professional maintenance visit should evaluate how the system operates, not merely rinse the outdoor cabinet and apply a service sticker.

A complete inspection may include:

• Reviewing thermostat and control settings
• Checking filters
• Inspecting indoor and outdoor coils
• Cleaning equipment where required
• Checking condensate drainage
• Inspecting refrigerant piping
• Evaluating refrigerant-system performance
• Testing electrical connections and current
• Inspecting the compressor and motors
• Checking blower and fan operation
• Measuring supply and return temperatures
• Measuring static pressure and airflow for ducted systems
• Testing heating and cooling modes
• Reviewing defrost operation
• Testing backup heat
• Checking furnace integration in dual-fuel systems
• Reviewing fault history where available

Best Time to Schedule Maintenance

Spring is a practical time to prepare the system for cooling. Early fall is a practical time to verify heating, defrost and backup operation.

Scheduling before extreme weather also reduces the chance of competing with every other homeowner after the first hot afternoon or cold night.

Maintenance Does Not Guarantee That Parts Will Never Fail

Routine service can identify developing problems and keep the equipment operating closer to its intended performance.

It cannot prevent every:

• Control-board failure
• Motor failure
• Compressor failure
• Sensor problem
• Refrigerant leak
• Power-supply issue

Maintenance reduces avoidable problems. It does not negotiate immortality with mechanical equipment.

Ductless Heat Pump Maintenance

Ductless systems require maintenance at every indoor unit as well as the outdoor equipment.

A multi-zone system may have several:

• Filters
• Indoor coils
• Blower wheels
• Drain pans
• Condensate lines
• Temperature sensors
• Communication circuits

Ductless Homeowner Tasks

• Clean filters when dirty
• Keep air intake and discharge clear
• Check for water leaks
• Watch for mouldy or musty odours
• Listen for fan vibration
• Check remote-control settings
• Keep the outdoor unit unobstructed

Ductless Professional Tasks

• Deep-clean contaminated indoor coils
• Clean blower wheels
• Flush condensate drains
• Test condensate pumps
• Inspect refrigerant connections
• Check temperature sensors
• Review error history
• Test multi-zone capacity and communication

Cleaning only the mesh filter does not remove contamination from the blower wheel or drain pan.

Central Ducted Heat Pump Maintenance

A central ducted system combines refrigeration equipment with a blower and duct distribution system.

Maintenance should evaluate:

• Central filter condition
• Indoor coil
• Blower assembly
• Condensate drainage
• Supply and return ductwork
• Static pressure
• Register and grille airflow
• Thermostat operation
• Electric auxiliary heat where installed

Electric Air Handler Systems

A full-electric system may include staged resistance heating elements.

The technician should verify:

• Heat-strip staging
• Electrical current
• Safety controls
• Sequencers or relays
• Thermostat commands
• Defrost heat operation

Unnecessary auxiliary heat operation can increase electricity use even when the heat pump itself is operating correctly.

Filter and Duct Compatibility

Changing to a high-efficiency filter without measuring pressure drop can create airflow problems.

Filter selection should balance filtration goals with the capacity of the blower and return duct system.

Dual-Fuel Heat Pump Maintenance

A dual-fuel system combines a heat pump and gas furnace. Both heating systems and their shared controls need inspection.

Heat pump maintenance includes:

• Outdoor unit
• Indoor coil
• Refrigerant piping
• Electrical components
• Defrost system

Furnace maintenance may include:

• Burners
• Ignition system
• Gas pressure
• Heat exchanger
• Venting
• Condensate system for condensing furnaces
• Safety controls
• Carbon monoxide considerations

Dual-Fuel Controls

The technician should confirm:

• Outdoor-temperature changeover setting
• Heat pump lockout
• Furnace lockout
• Defrost operation
• Whether both systems can operate together
• Thermostat configuration
• Equipment compatibility

Incorrect control settings may cause the furnace to operate too early, prevent required backup heat or allow incompatible heating stages to run together.

Heat Pump Warning Signs That Need Professional Service

Schedule diagnosis when you notice:

• The system does not heat or cool
• Indoor temperature continues moving away from the setpoint
• The breaker trips repeatedly
• The unit displays an error code
• The indoor coil freezes
• The outdoor coil remains heavily iced
• The system starts and stops repeatedly
• Airflow becomes weak
• The indoor unit leaks water
• The outdoor fan does not operate
• The compressor makes abnormal sounds
• There is a burning or electrical smell
• Energy consumption rises without a clear weather explanation
• Backup heat operates continuously in mild weather
• The system runs only in Emergency Heat
• A ductless indoor unit develops a persistent musty odour

Turn the System Off and Request Urgent Service When:

• There is smoke or a burning smell
• Water is contacting electrical equipment
• The breaker trips immediately after reset
• The equipment is making severe grinding or impact sounds
• The outdoor fan is striking ice or the cabinet
• The installation has loose electrical wiring or damaged refrigerant piping

Do not continue resetting breakers or forcing the equipment to run through repeated faults.

Heat Pump Maintenance Checklist for BC Homeowners

Monthly Checks

• Inspect filters.
• Check indoor airflow.
• Keep registers and return grilles clear.
• Check ductless indoor units for water leaks.
• Confirm thermostat settings.
• Check the outdoor unit for debris.
• Listen for new or unusual sounds.

Cooling-Season Checks

• Check condensate drainage.
• Watch for indoor coil freezing.
• Keep windows and doors closed during operation.
• Check whether upper floors receive adequate airflow.
• Monitor indoor humidity and comfort.

Heating-Season Checks

• Use Heat mode.
• Use a stable thermostat setting.
• Watch normal defrost operation.
• Keep defrost drainage clear.
• Monitor backup heat.
• Check for persistent outdoor-coil ice.
• Keep snow and debris away from the unit.

Annual Professional Checks

• Inspect and clean coils as required.
• Check electrical connections.
• Test compressor, motors and controls.
• Inspect refrigerant piping.
• Verify temperature performance.
• Check condensate pans and drains.
• Measure ducted airflow and static pressure.
• Test defrost and backup heating.
• Review fault history.
• Confirm safe and reliable operation.

Heat Pump Maintenance and Diagnostic Service

Bernoulli Heating and Cooling provides heat pump inspection, maintenance and diagnostic service across Metro Vancouver and the Fraser Valley.

We service ducted, ductless, multi-zone, full-electric and dual-fuel systems.

A diagnostic appointment for an existing heat pump system is $135. Repair materials, refrigerant, replacement components and additional labour are quoted separately when required.

New heat pump installation estimates are free.

Call 604-518-4438 or email heatingbernoulli@gmail.com to arrange service.

Explore local heat pump installation information:

• Heat Pump Installation Vancouver
• Heat Pump Installation Burnaby
• Heat Pump Installation Surrey

For additional homeowner guidance, review the official ENERGY STAR HVAC maintenance checklist and the Natural Resources Canada home heating and cooling maintenance guidance.