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Troubleshooting
A Class HP Installation a
nd User Instructions R02583
-6 09/15
Page
36
Figure 18: Adjustment Water Temperature Direct
Electric Heating Element
10.4 Maintenance
The maintenance of this appliance
must be carried out by a suitably
qualified person only. It is
recommended to maintain the unit on
an annual basis. Isolate all electrical
supplies from the unit before
commencing work. Danger of
electrical shock! See Section 7.
10.5 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 Auxiliary heating
malfunction
B.3 Direct heating malfunction
B.4 Auxiliary/direct heating
high limit thermostat has
tripped
B.1 Set timer/programmer
correctly
B.2 Consult auxiliary 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 /
maintenance, 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.1Compression/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
Table 9: Troubleshooting Guide
Dial to adjust
water temperature
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