21
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) Low mains water Check pressure, consult
pressure Local Water Authority if
necessary
REDUCED FLOW 2) Line strainer Turn off mains water supply,
RATE partially blocked remove line strainer and
clean
3) Size 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
switched 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 necessary
(Indirect models)
DISCHARGE FROM 1) Pressure above 7 Shut down boiler or immersion
PRESSURE/ bar, failure of heater. Check pressure
TEMPERATURE pressure reducing reducing valve and thermal
RELIEF VALVE valve. Temperature controls. Replace if
above 90 C failure necessary
of thermal control
DISCHARGE FROM 1) Continually. Check pressure from valve.
EXPANSION Pressure reducing Replace if over 3.5 bar
VALVE valve faulty
2) When heater is heating. Check charge of vessel. Re-
Faulty expansion charge vessel to 3.5 bar or
vessel or lost charge replace if necessary
5. FAULT FINDING
To Next Page
Loading...
