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This document is stored and maintained electronically by
Service. All printed copies are deemed uncontrolled.
TM077: 325 & 410 Series II Heat Pump Service Instructions
Rev 00: Issued April 2014
Fault Finding: Chart 11.11
Compressor Troubleshooting
11.11
NOTES
1. The reset button will reset Fault 9, reset the Fault 9 counter and clear the stored
Fault Code from the controller memory.
2. Fault 9 will not disable all heating unless it has occurred 3 consecutive times.
3. If Fault 9 has occurred, the refrigerant high pressure switch may also have tripped.
Is 240 volts present at the
compressor terminals?
TEST 16
Repair or replace the faulty
compressor wiring.
Is 240V present at the
compressor plug?
TEST 17
Replace the controller.
Are the compressor motor
winding resistances correct?
TEST 18
YES
9
Compressor internal overload switch
may have opened.
Wait 15 minutes for the overload
switch to cool and auto-reset.
Are the compressor motor
winding resistances correct?
TEST 18
Is the compressor casing
temperature greater than 110°C?
Replace the compressor.
NO
Is the compressor capacitor
working?
TEST 19
YES
NO
NO
YES
NO
YES
NO
YES
NO
Reset the heat pump using the reset
button, and use the proxy sensor or
draw off water to initiate a call for
heating.
Allow the system to run until the
compressor internal overload switch
trips again.
YES
Replace the controller.
9
Has the refrigerant high pressure
switch tripped?
TEST 15
Reset the refrigerant high pressure
switch.
YES
9
NO
