'& "!%%'%% $+
1) Mains cold water Check and open Isolating
supply shut off and/or stop valve. Check
water, Local Water Authority
!!&)&$ 2) Line strainer Turn off mains water supply,
!) 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
$'!) 2) Line strainer Turn off mains water supply,
$& partially blocked remove line strainer and
clean
3) Size of service Increase to size stated on
pipe too small page 9
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
)&$$! 3) Boiler programmer Check switch on domestic
!&&"% set to central hot water if necessary
%! heating only
(Indirect models)
4) Boiler is not Check boiler operation, if
functioning fault suspected consult
(Indirect models) manufacturer's instructions
5) Indirect thermal Test thermostat operation
cut-out has and wiring, if faulty,
operated correct/replace. Reset
cut-out
6) Motorised valve Check wiring and operation of
jammed or not motorised valve correct/
wired correctly replace as necessary
(Indirect models)
%$$! 1) Pressure above 7 Shut down boiler or immersion
"$%%'$ bar, failure of heater. Check pressure
&"$&'$ pressure reducing reducing valve and thermal
$(( valve. Temperature controls. Replace if
above 90ºC failure necessary
of thermal control
%$$! 1) Continually. Check pressure from valve.
*" %! Pressure reducing Replace if over 3.5 bar
(( valve faulty
2) When heater is heating. Check charge of vessel. Re-
Faulty expansion charge vessel to 3.5 bar or match
vessel or lost charge incoming mains pressure
replace if necessary
3) Back feed of high mains Service / replace mixer
pressure via mixer.
)&$@$ 1) Expansion Vessel fitted Ensure vessel is fitted horizontally or
vertically. connection at top.
2) Pipework not secure Clip pipework
3) Jumpers on taps loose Replace tap jumpers
4) Flexible hose connecting Remove flexible hose and hard pipe.
expansion vessel
29
6. FAuLT FINd ING
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