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TM077: 325 & 410 Series II Heat Pump Service Instructions
Rev 00: Issued April 2014
Fault Finding: Chart 11.3
Red LED: 3 flashes
Fault 3
Compressor Cooling Fault
11.3
Does the compressor commence
operation
immediately
on
restoration of power?
Replace the controller.
Turn off the mains power to the heat
pump and then turn on again.
Do not use the reset button.
Replace the compressor sensor.
NO
YES
Fault Finding: Chart 11.4
Red LED: 4 flashes
Fault 4
Tank Sensor Fault
11.4
1. Ensure the sensor is firmly plugged
into the correct socket.
2. Ensure that the sensor plug pins are
clean and making firm electrical
contact.
NO
Is the tank sensor firmly plugged
into the correct socket on the
controller?
Is the tank sensor working?
TEST 1
Replace the sensor.
NO
YES
Replace the controller.
YES
Fault Finding: Chart 11.5
Red LED: 5 flashes
Fault 5
Evaporator Sensor Fault
11.5
1. Ensure the sensor is firmly plugged
into the correct socket.
2. Ensure that the sensor plug pins are
clean and making firm electrical
contact.
NO
Is the evaporator sensor firmly
plugged into the correct socket on
the controller?
Is the evaporator sensor working?
TEST 1
Replace the sensor.
NO
YES
Replace the controller.
YES
