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FAULT FINDING

FAULT

NO HOT WATER

FLOW

REDUCED FLOW

RATE

WATER FROM

HOT TAPS

IS COLD

DISCHARGE FROM

PRESSURE/

TEMPERATURE

RELIEF VALVE

DISCHARGE FROM

EXPANSION

VALVE

POSSIBLE CAUSES

1) Mains cold water

supply shut off

2) Line strainer

blocked

3) Cold Water

Combination valve

fitted incorrectly

1) Low mains water

pressure

2) Line strainer

partially blocked

3) Size of service

pipe too small

1) Direct immersion

heater is not

switched on

2) Direct thermal

cut-out has

operated

3) Boiler programmer

set to central

heating only

(Indirect models)

4) Boiler is not

functioning

(Indirect models)

5) Indirect thermal

cut-out has

operated

6) Motorised valve

jammed or not

wired correctly

(Indirect models)

1) Pressure above 7

bar, failure of

pressure reducing

valve. Temperature

above 90 C failure

of thermal control

1) Continually.

Pressure reducing

valve faulty

2) When heater is heating.

Faulty expansion

vessel or lost charge

REMEDY

Check and open Isolating

and/or stop valve. Check

water, Local Water Authority

Turn off mains water supply,

remove line strainer and

clean

Check direction of flow

arrows on valve, refit in

correct position if necessary

Check pressure, consult

Local Water Authority if

necessary

Turn off mains water supply,

remove line strainer and

clean

Increase to size stated on

page 6

Check immersion heater,

switch on if necessary

Test thermostat operation

and wiring, if faulty,

correct/replace. Reset cut-out

Check switch on domestic

hot water if necessary

Check boiler operation, if

fault suspected consult

manufacturer's instructions

Test thermostat operation

and wiring, if faulty,

correct/replace. Reset

cut-out

Check wiring and operation of

motorised valve correct/

replace as necessary

Shut down boiler or immersion

heater. Check pressure

reducing valve and thermal

controls. Replace if

necessary

Check pressure from valve.

Replace if over 3.5 bar

Check charge of vessel. Re-

charge vessel to 3.5 bar or

replace if necessary