12. FAULT FINDING
Notice: Disconnect electrical supply before removing any
electrical equipment cover.
FAULT POSSIBLE CAUSE REMEDY
No hot water
1. Mains supply off.
2. Strainer in pressure
reducing valve
blocked.
3. Pressure reducing
valve incorrectly
fitted.
1. Open stopcock.
2. Turn water supply off,
remove strainer and clean.
3. Re-fit correctly.
Water from hot taps
is cold
1. Programmer if fitted
is not switched on.
2. High limit thermostat
has tripped.
1. Switch on the
programmer.
2. Check and re-set.
Intermittent water
discharge through
tundish on warm-up
1. Expansion vessel
has lost its charge
pressure.
1. Turn off stopcock, open
a hot water tap, check
vessel charge pressure
and recharge
Continuous water
discharge
1. Pressure reducing
valve not working.
2. Expansion relief
valve not seating
correctly.
3. Temperature and
pressure relief valve
not seating correctly.
1. Check pressure from
pressure reducing valve
if greater than 0.3 MPa
replace cartridge.
2. Manually lift the valve
once or twice to clear
any debris from the seat
otherwise replace valve.
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