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HP Installatio
n and User Instructions R00918
-10 09/15
Page
47
Troubleshooting
9.4 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 Auxiliary heating
malfunction
B.3 Direct heating mal
function
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.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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