38
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 8
Is the water pressure more than
80% of the T&PR valve rating?
Check all other appliances or valves
that can generate noise, such as
washing machines, dishwashers, ball
valves etc.
Refer to the Common Complaints
section.
Evaporator fan noise
–
mechanical or air related?
Fan loose or bearing failure.
Replace fan assembly.
Is the noise water hammer?
Is the noise only evident when
water is flowing through the
heater?
1. Fit a 600kPa pressure limiting valve.
2. Check for restrictions in the pipe
work, faulty valves, loose plumbing or
other appliances such as washing
machines, dishwashers etc.
AIR
Is the noise only evident when
power is available to the heater?
If this level is affecting neighbours, a
timer should be fitted to prevent
operation during the affected hours or
to comply with local council
regulations.
MECHANICAL
YES
Cylinder contracting due to pressure
release when a hot tap is opened. This
can be accompanied by a creaking or
cracking sound.
Normal Operation
Is the noise a metallic popping
sound?
Check for a faulty stop cock, non-
return valve or T&PR valve.
YES
NO
YES
YES
NO
NO
Noisy Water Heater
Is the noise:
A “jack-hammering” sound?
Severe and / or includes
vibration of the heat pump?
An abnormally loud
compressor?
The heat pump module (not the
storage tank) MUST be immediately
decommissioned and replaced.
Is the noise due to loose fittings
or sheet metal rattling?
Tighten the loose fittings or sheet
metal fixing screws.
YES
Is the noise due to copper pipes
or flexible hoses rubbing against
each other or other components?
Separate the components that are
making contact and insulate if
necessary.
YES
YES
YES
NO
The heat pump module (not the
storage tank) MUST be immediately
decommissioned and replaced.
Is the TX capillary tube the ONLY
broken pipe?
YES
NO
YES
NO
NO
NO
8
Is the noise due to normal
compressor operation?
NO
YES
NO
Is the noise due to insufficient
support under the heat pump
module‟s feet?
Requested the installer to rectify the
installation.
YES
NO
NO
Replace the TX valve.
Is there any evidence of broken
or fractured refrigerant piping, in
particular the suction line and / or
the TX capillary tube?
