44
Henrad SE FF
- Installation
FAULT FINDING
79 FAULT FINDING CHART 1 - Fan Not Running Correctly
NB:
Mains supply for this boiler
is 230 V AC 50 Hz
FOOT NOTE.
Presence of live supply on a terminal may be checked with a multimeter set to the appropriate AC
range (apply the other probe of the meter to Mains neutral, e.g. on terminal N of the incoming supply).
Recheck supply route to Board 37.
Check the 'stat is fully on and that the boiler is
not up to temperature. If the 'stat is still open
circuit, replace it.
Is there mains voltage between supply
terminals of Board 37 ?
Replace fuse. Before refiring, check all
components / leads connected to
Board 37 for faults
YES
YES
NO
NO
Check all connections to Board 37.
Check for moisture.
If no fault found, check Board 37 by substitution
YES
NO
YES
Return to main
menu
The fan should now run
Has fuse blown on
Board 37
(Fuse is OK if LED 4
is lit)
YES
Is there mains voltage on BOTH terminals
of boiler control thermostat ?
YES
YES
Reset overheat 'stat. Set control 'stat to
maximum. Allow boiler to reach temperature.
If overheat 'stat trips again, measure flow temp:
If over
90 °C replace control 'stat
If under 90 °C replace overheat 'stat
Is there mains voltage on BOTH terminals of
overheat thermostat ? (
see footnote)
NO
Replace
overheat 'stat
Can overheat 'stat be
reset when system cold ?
NO
Is there mains voltage between supply
terminals on fan motor ?
Does the fan run when LED 3, on
the PCB, is lit ?
Change fan
NO
NO
Check mains supply and fuses.
Check system controls are calling for heat.
Check operation of motorised valves and
switches therein
NO
YES
Is there mains voltage between boiler
supply terminals L and N ?
F
AUL
T FINDING
Summary of Contents for Henrad SE 30 FF
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