Professional diagnosis for heat pumps that are not heating or cooling correctly, not starting, cycling unexpectedly, icing or showing unusual operating behaviour.
Langley service area: We diagnose and repair heat pumps throughout Langley Township and Langley City — including Willoughby, Walnut Grove, Murrayville, Brookswood and Fort Langley. Langley's mix of newer townhome developments and larger suburban and rural properties means heat pump configurations vary: compact ductless installations in Willoughby townhomes, ducted central systems in larger detached homes, and a range of installation ages across the area. We work on ducted and ductless heat pump systems across makes and models.
What We Diagnose
Heat pump faults can look similar on the surface but have different causes. These are the conditions we most commonly diagnose at Langley service calls.
The system runs but the home doesn't reach setpoint — or the output feels noticeably weaker than it should. Common causes include low refrigerant from a leak, a failing compressor, a faulty reversing valve (which switches between heating and cooling mode), or a capacitor failure. Outdoor temperature context matters too: a unit at or near its rated low-temperature limit will deliver reduced output in very cold conditions.
The heat pump doesn't respond to a call from the thermostat, or starts and trips immediately. Capacitor failure is a common cause and is often repairable in a single visit. Electrical faults in the contactor, control board or low-voltage wiring can also prevent a start. A compressor that trips immediately on startup needs pressure and electrical checks to determine the fault.
The heat pump starts and stops in short intervals rather than completing a full run cycle. Short-cycling can result from a refrigerant pressure issue, a failing compressor, restricted airflow causing a safety limit to trip, or an oversized system for the space. In multi-level Langley homes, upper-floor temperature sensors that read warmer than the main floor can also cause the system to terminate a call early.
Some frost on the outdoor coil during heating mode is normal — the system runs a defrost cycle to clear it. Persistent heavy ice that builds across the coil and doesn't clear, icing that occurs during cooling mode, or very frequent defrost cycling are worth investigating. These can indicate a refrigerant issue, a defrost board or sensor fault, or an airflow restriction at the outdoor unit — worth having checked rather than ignoring.
Weak or uneven output from indoor units, rooms that don't reach setpoint, or the system not responding to thermostat calls. In ducted systems, airflow issues often point to filter condition, blower motor performance or duct restrictions. In ductless installations across multi-level Langley homes, a single indoor head serving multiple areas may struggle if coverage wasn't sized for the actual space.
Banging, grinding, rattling or squealing from the indoor or outdoor unit during operation. Loose components, worn fan bearings, a damaged compressor or refrigerant flow restrictions can each produce distinct sounds. Noise that changes with operating mode — louder in heating vs cooling — can help narrow the diagnostic. A grinding or metal-on-metal sound should be investigated promptly.
Frost and defrost in Langley winters: Langley's climate is typically mild to cool in winter — not severe cold. Heat pumps in this area defrost routinely and generally handle local conditions well. If your outdoor unit is building up heavy ice that persists through what should be a defrost cycle, or you notice performance has dropped noticeably in conditions that shouldn't be unusually challenging, that's worth a service call — it's not something to attribute to weather and wait out.
Refrigerant handling is regulated. Only certified technicians may purchase or handle refrigerants under Canadian regulations. If you suspect a refrigerant leak — the system isn't maintaining output, pressures read low, or there's an oily residue near line connections — do not attempt to add refrigerant yourself. Leak detection, repair and a verified recharge are part of our service.
Decision Guide
Most heat pump faults are repairable. Replacement becomes the better conversation when repair cost, system age and reliability align in that direction.
If the technician recommends replacement, we can discuss options suited to your home and Langley conditions. See our Heat Pump Installation Langley page or heat pump replacement guidance for what that process involves.
FAQ
Contact us to discuss the symptoms and arrange a diagnostic service call across the Langley area.
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