IDEAL icos system HE15 Installation And Servicing page 55

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80 L.....E.....
Check for an excess voltage between
neutral and earth.
Is the value below 50V?
LE ONLY
Is continuity of OH thermostat correct?
HE ONLY
Is earth wire connected to
detection lead correctly?
Have all earths been
checked for continuity?
Internal fault within the PCB
Press and hold reset button for 2 seconds.
Does boiler operate correctly?
Turn boiler off and wait for 5 seconds.
Turn boiler on.
Does boiler operate correctly?
Replace PCB
icos system -
Installation and Servicing
FAULT FINDING
or H.....E..... (PCB ERROR)
NO
YES
NO
YES
NO
YES
NO
YES
YES
NO
YES
NO
Check earth connection to the boiler. If it is
still in excess of 50 V consult a qualified
electrician to check the household
electrical supply and circuitry.
Correct wiring or replace thermostat.
Correct wiring or replace detection lead.
Correct connections
OK
OK
55