Back: Heat Pumps

Faults & Diagnosis

Heat Pumps

Heat Pump: Common Faults & Troubleshooting Guide Before Calling a Technician

Heat Pumps

Intermittent faults and recurring lockouts: a complete diagnostic checklist

Heat Pumps

Heating-DHW three-way valve not switching correctly: symptoms and troubleshooting

Heat Pumps

Electric resistance relay or contactor fault: how to identify it

Heat Pumps

Crankcase heater fault: what it can cause at low temperatures

Heat Pumps

Fan speed feedback fault: when the fan is spinning but the controller reports an alarm

Heat Pumps

Discharge temperature sensor providing incorrect reading: how to verify it

Heat Pumps

Clogged plate heat exchanger: symptoms and how to diagnose

Heat Pumps

Very small supply-return ΔT: when is it an indication of a problem

Heat Pumps

Large supply-return ΔT in heat pumps: what it indicates

Heat Pumps

Compressor overcurrent and overload in heat pumps: causes and diagnosis

Heat Pumps

The heat pump is running but providing low heat: a complete checklist

Heat Pumps

Potential refrigerant leak: what signs indicate a need for inspection

Heat Pumps

Phase loss and incorrect phase sequence in a three-phase heat pump

Heat Pumps

Overvoltage and undervoltage alarm: how power supply affects the heat pump

Heat Pumps

Domestic hot water does not reach target temperature: what could be the cause

Heat Pumps

The circulator does not start: electrical and hydraulic diagnosis

Heat Pumps

Freeze protection alarm: why it activates and how to diagnose it

Heat Pumps

Low water pressure alarm on a heat pump: what to check

Heat Pumps

Four-way valve failure: how it affects heating, cooling, and defrost

Heat Pumps

Electronic Expansion Valve (EEV) Failure: Symptoms and Diagnosis

Heat Pumps

How to properly use alarm history, trends, and actual measurements for diagnostics

Heat Pumps

Incorrect room temperature on the controller: causes and diagnosis

Heat Pumps

Noise and vibrations in heat pumps: when they are normal and when they are not