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TM077: 325 & 410 Series II Heat Pump Service Instructions
Rev 00: Issued April 2014
Fault Finding: Chart 11.1
Red LED: 1 flash
Fault 1
Compressor Over-Temperature (> 110°C)
11.1
Replace the sensor.
NO
Is the compressor sensor
working?
TEST 1
YES
9
Is the tank sensor firmly attached
to the tank?
Stud Mount: Tighten the nut retaining
the sensor to the stud on the tank and
ensure the heat transfer pad is in
place.
External Jacket Mount: Ensure the
sensor has clean contact with the
cylinder, the spring is OK and the
mounting screw is tight.
NO
YES
Is the tank sensor working?
TEST 1
Replace the sensor.
NO
YES
YES
Reset the heat pump using the
reset button, and use the proxy
sensor or draw off water to initiate
a call for heating.
Does the evaporator fan come on
at the same time as the
compressor, and run in the
correct direction at full speed?
The evaporator
fan exhausts air
out the front of
the heat pump.
YES
Is there a water flow problem?
11.10
NO
Is 240 volts present at the
fan plug?
TEST 10
Is the fan plug firmly and correctly
connected to the controller?
NO
YES
YES
YES
NO
Connect the fan wiring or plug firmly
and correctly to the controller.
12
NO
YES
Ensure that the plug pins are clean
and making firm electrical contact. If
the pins are OK, replace the controller.
Replace the fan.
Are the fan motor winding
resistances correct?
TEST 11
Is the fan capacitor working?
TEST 12
Replace the controller.
NO
NO
Is the fan wiring faulty or
incorrect?
Repair or replace the faulty fan wiring.
YES
Replace the controller.
NO
