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Installat
ion and User Instructions R01127
-
2 06
/11
Page 32
Troubleshooting
10.4 Troubleshooting
Fault Cause Solution
A No water
from hot
water taps
A.1 Stop valve closed
A.2 Strainer blocked
A.3 Pressure reducing valve
fitted against flow
A.1 Open stop valve
A.2 Turn water supply off,
clean strainer and re-
commission
A.3 Re-fit with arrow showing
in direction of flow
B No hot water B.1 Timer/Programmer not set
correctly
B.2 Indirect heating
malfunction
B.3 Direct heating malfunction
B.4 Indirect/direct heating high
limit thermostat has tripped
B.1 Set timer/programmer
correctly
B.2 Consult indirect heating
system instructions
B.3 Call for qualified person
to check immersion
heater
B.4 Reset limit thermostat(s)
and inform installer
C Intermittent
water
discharge
through
tundish on
warm-up
C.1 Expansion vessel lost
charge
C.1 Check expansion vessel
(see
commissioning/maintena
nce), top up or replace
D Continuous
discharge
D.1 Pressure reducing valve not
working
D.2 Pressure relief or T&P valve
not seating correctly
D.3 Malfunction of high limit
thermostat or appliance
D.1 Check pressure after
valve and replace if
faulty
D.2 Manually lift valve once
or twice to clear debris,
otherwise replace
D.3 Check function of
thermostats and
appliances
E Leakage from
casing
E.1 Compression/threaded
joints not formed correctly
E.1 Re-seal joints with care
F Hot water
from cold tap
F.1 Hot pipe work being routed
adjacent to cold pipe work
F.2 Leaking seal in mixer tap
F.1 Insulate hot pipe work or
re-route
F.2 Replace seals in mixer
tap
G Metallic noise
from system
G.1 Pipe work not sufficiently
supported
G.1 Add extra pipe work
fixings
H Humming
noise from
system during
re-heat
H.1 Air in system
H.2 Flow rate well in excess of
specification
H.1 Bleed system thoroughly
and re-pressurize
H.2 Reduce pump speed
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