Troubleshooting - Quantum IOT Series Installation And User Instructions Manual

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Troubleshooting

Fault
A No water from hot
water taps
B Intermittent water
discharge through
tundish on warm-up
C Continuous discharge
D Leakage from casing
E Hot water from cold tap
F Metallic noise from
system
G Humming noise from
system during re-heat
H Cylinder not charging
I The water in the
cylinder is too hot
J Hot water runs out
during the day
Cause
A.1 Stop valve closed
A.2 Strainer blocked
A.3 Pressure reducing valve
fitted against flow
B.1 Expansion vessel lost
charge
C.1 Pressure reducing valve
not working
C.2 Pressure relief or T&P
valve not seating
correctly
C.3 Malfunction of high limit
thermostat or appliance
D.1 Compression/threaded
joints not formed
correctly
E.1 Hot pipework being
routed adjacent to cold
pipework.
E.2 Leaking seal in mixer tap
F.1 Pipework not sufficiently
supported
G.1 Air in system
G.2 Flow rate well in excess
of specification
H.1 Power supply turned off
H.2 Tariff not set correctly
H.3 Temperature set-point
not set correctly
H.4 Direct heating
malfunction
H.5 Direct heating high limit
thermostat has tripped
I.1 Primary/Boost
temperature set point is
too high
I.2 Hygiene mode overriding
primary set-point
I.3 Temperature sensors
faulty or not installed
correctly
J.1 Cylinder not storing
enough energy to meet
daily requirements
J.2 Increased usage resulted
in hot water ran out
earlier than usual
Troubleshooting
Solution
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.1 Check expansion vessel (see
commissioning/maintenance),
top-up or replace
C.1 Check pressure after valve and
replace if faulty
C.2 Manually lift valve once or twice to
clear debris, otherwise replace
C.3 Check function of thermostats
and appliances
D.1 Re-seal joints with care
E.1 Insulate hot pipework or re-route
E.2 Replace seals in mixer tap
F.1 Add extra pipework fixings
G.1 Bleed system thoroughly and
re-pressurise
G.2 Reduce pump speed
H.1 Ensure both power supplies are
turned on
H.2 Set tariff correctly (Section 7.2.1)
H.3 Set Primary Set-point
(Section 11.2.4)
H.4 Call for qualified person to check
immersion heater
H.5 Reset limit thermostat(s) and
inform installer
I.1 Check/Adjust the primary and
boost temperature set-points
(Section 11.2.4)
I.2 Check/Adjust the Hygiene Set
point (Section 7.2.2)
I.3 Check temperature displayed
for accuracy (Section 11.2.6),
if clearly incorrect contact
seller
J. 1 Raising the Primary set-point in
order to store additional energy
during the off peak period (Section
11.2.4)
J.2 Boost function heats a small
volume of water (Section 11.2.5)
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