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FAULT POSSIBLE CAUSES REMEDY
1) Mains cold water Check and open Isolating
supply shut off and/or stop valve. Check
water, Local Water Authority
NO HOT WATER 2) Line strainer Turn off mains water supply,
FLOW blocked remove line strainer and
clean
3) Cold Water Check direction of flow
Combination valve arrows on valve, refit in
fitted incorrectly correct position if necessary
1) Lo
w mains water Check pressure, consult
pressure Local Water Authority if
necessar
y
REDUCED FLO
W
2) Line str
ainer Turn off mains water supply,
RATE partially blocked remove line strainer and
clean
3) Siz
e of service Increase to size stated on
pipe too small page 6
1) Direct immersion Check immersion heater,
heater is not
switch on if necessary
s
witched on
2) Direct thermal Test thermostat operation
cut-out has and wiring, if faulty,
operated correct/replace. Reset cut-out
WATER FROM 3) Boiler programmer Check switch on domestic
HOT TAPS set to central hot water if necessary
IS COLD heating only
(Indirect models)
4) Boiler is not Check boiler operation, if
functioning fault suspected consult
(Indirect models) manufacturer's instructions
5) Indirect thermal Test thermostat operation
cut-out has and wiring, if faulty,
operated correct/replace. Reset
cut-out
6) Motorised valve Check wiring and operation of
jammed or not motorised valve correct/
wired correctly
replace as necessar
y
(Indirect models)
DISCHARGE FROM 1) Pressure above 7 Shut down boiler or immersion
PRESSURE/ bar
, f
ailure of
heater
. Check pressure
TEMPERATURE pressure reducing reducing valve and thermal
RELIEF VALVE valve. Temperature controls. Replace if
above 90 C failure necessary
of ther
mal control
DISCHARGE FROM 1) Continually. Check pressure from valve.
EXPANSION Pressure reducing Replace if over 3.5 bar
V
AL
VE
v
alv
e faulty
2) When heater is heating. Check charge of vessel. Re-
Faulty expansion charge vessel to 3.5 bar or
v
essel or lost charge replace if necessary
5. FAULT FINDING
www.tradeplumbing.co.uk Call Sales On 08708034288
www.tradeplumbing.co.uk Call Sales On 08708034288