40
TM063 701, 702 & 703 Series Boiling Water Unit Service Instructions
Revision D: Feb 2017
This document is stored and maintained electronically by Service. All printed copies not bearing this statement in RED are deemed “uncontrolled”
Fault Finding Chart 7
7
YES Replace Heating unit.
Is noise a creaking
or cracking sound?
NO
Is noise only
evident when electric
heating cycle is on?
NO
Poor quality water supply i.e.
dam water. Flush tanks.
NO
Is noise water
hammer?
YES
Is noise only evident
when water is flowing
through heater?
NO
NO
Is water pressure >
800kPa?
YES
YES
Is noise an
occasional clicking
sound?
YES
NO
Refer to ‘water hammer’ in the
common complaints section.
Check for:
Restrictions in pipe work, faulty
valves, loose plumbing, other
appliances i.e. washing machine
or dishwasher.
Fit 600kPa PLV if pressure is
excessive.
Check for a faulty stop cock,
non-return valve, loose
component or screws.
NO
Is there mineral
build up on BW
heating unit?
YES
Expansion & contraction noise
associated with heating. Normal
operation.
YES
Control board relay operation.
Normal operation.
Check other appliances that can
generate noise i.e. washing
machine, dishwasher, ball cocks
etc.
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