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TM077: 325 & 410 Series II Heat Pump Service Instructions
Rev 00: Issued April 2014
Fault Finding: Chart 1
The heat pump is not suitable for an
off peak connection.
Connect to continuous tariff or Off
Peak 2, if available.
Restore power and advise customer.
Fault in household electrical wiring.
YES
1. Heat pump connected to mixed
circuit, possible excessive current
draw or another appliance with a fault.
2. Faulty circuit breaker or fatigued
fuse wire.
3. Unit may be short cycling due to
faulty thermostat.
Is 240 volts present at the
thermostat?
TEST 2
Is the heater connected to an off
peak tariff?
Is the isolating switch or time
clock turned off?
Is the fuse blown at the
switchboard?
Did the fuse or circuit breaker
blow again?
YES
NO
YES
NO
YES
NO
NO
YES
NO
No Hot Water
(No Power)
Reset circuit breaker
or rewire fuse.
Are the thermostat contacts
closed?
TEST 4
Are the thermostat ECO contacts
closed?
TEST 3
NO
NO
Is 240 volts present at the
controller?
TEST 5
Replace the thermostat.
NO
YES
Replace the controller.
YES
YES
Contacts close when the
water temperature is
approximately 62°C.
1
Wiring incorrect.
Check the controller mains plug and
mains wiring loom from the
thermostat.
10
Is the element installed in the
correct orientation?
Install the element correctly and
reset the ECO.
YES
NO
Fault Finding: Charts 2 and 3
Is the Fault Code being displayed
Fault 9?
(9 red flashes)
No Hot Water
(Fault 9 or Element Mode)
2
3
11
YES
Does the element have the
correct resistance?
TEST 6
Replace the element.
NO
1. Possible wiring failure
– locate and
repair the failure.
2. Main relay failure in controller
–
replace the controller.
YES
NO
NOTE
If a Fault Code was being displayed, re-start fault
diagnosis after the element problem is resolved.
