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FAULT - Poor Water Flow at Hot Taps
FAULT - Water Discharge Into Tundish
Water service check by
supply company required
Clean or replace strainer
as appropriate
Service /replace PRV
as appropriate
START
END
Is incoming mains supply
flow/pressure adequate?
Is in-line strainer
(in combination valve)
clean?
YES
YES
YES
YES
NO
NO
NO
Clear obstructions
Is system free from
restrictions/blockages?
YES
NO
Is pressure reducing valve
(in combination valve)
working?
Clean or replace
as required
Is expansion vessel
charge pressure correct?
Replace ERV/TPRV
Replace PRV
END
START
Is pressure downstream
of pressure reducing valve
correct?
Is valve seal and seat
clean & undamaged?
Is heater operating at
less than 60ºC?
Re-set temperature
NO
YES
YES
NO
NO
YES
YES
Is ERV/TPRV
discharging?
YES
Recommission
expansion
vessel pressure
NO
NO
FAULT - No Hot Water (Direct)
FAULT - No Hot Water (Indirect)
Switch on
Re-set
Replace element
START
Is power on to elements?
Is control temperature
set at 60ºC - 65ºC?
Has high limit tripped?
Check wiring links
continuity and Re-set
END
YES
YES
YES
NO
NO
NO
Switch on
Set programmer
Re-set, check wiring &
plumbing is correct
Re-set
Is all wiring to the
controls ok?
Replace thermostat
Re-wire
START
Is boiler on?
Is hot water programmer
in ‘on’ position?
Is zone valve in
correct position?
Is control temperature
set at 60ºC - 65ºC?
Has high limit cut out?
Re-set
END
YES
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO
NO
SERVICING AND MAINTENANCE
SERVICING AND MAINTENANCE
FAULT FINDING
FAULT FINDING
