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TM077: 325 & 410 Series II Heat Pump Service Instructions
Rev 00: Issued April 2014
Fault Finding: Chart 5
Is the T&PR valve continuously
discharging water?
Is the water pressure more than
80% of the T&PR valve rating?
1. Pressure limiting valve missing or
faulty.
Fit or replace pressure limiting valve.
2. Replace the T&PR valve if required.
Is the heater of sufficient capacity
for the customer‟s needs?
Are there any plumbing leaks,
crossed water connections or
dripping taps?
1. Repair leaks.
2. Isolate crossed water connections.
The heat pump is not suitable for
off peak connection. Connect to
continuous tariff or off peak 2,
if available.
YES
YES
Is the correct T&PR valve fitted?
Replace the T&PR valve with one of
the correct pressure rating.
Do NOT use reconditioned T&PR
valves.
1. Check for a crossed water
connection.
2. Replace the T&PR valve.
Is the water temperature at the
T&PR valve 60ºC or higher?
Is a tempering valve fitted?
Is the heater connected to an
off peak tariff?
Recommend a water heater of
sufficient capacity to meet the
customer‟s needs.
NO
NO
YES
NO
NO
YES
NO
YES
Insufficient Hot Water
NO
YES
YES
5
9
6
Is the tank sensor working?
TEST 1
NO
Replace the tank sensor.
NO
Has the supply of hot water
recently been significantly
depleted?
The water heater may take up to 12
hours to fully recover, depending on
the ambient temperature.
YES
NO
NO
YES
YES
