55
icos system - Installation and Servicing
FAULT FINDING FAULT FINDING FAULT FINDING FAULT FINDING
FAULT FINDING
80
L.....E..... or H.....E..... (PCB ERROR)
Internal fault within the PCB
Press and hold reset button for 2 seconds.
Does boiler operate correctly?
Check for an excess voltage between
neutral and earth.
Is the value below 50V?
NO
NO
NO
NO
YES
YES
YES
YES
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.
LE ONLY
Is continuity of OH thermostat correct?
Correct wiring or replace thermostat.
HE ONLY
Is earth wire connected to
detection lead correctly?
Correct wiring or replace detection lead.
Have all earths been
checked for continuity?
Correct connections
Replace PCB
Turn boiler off and wait for 5 seconds.
Turn boiler on.
Does boiler operate correctly?
NO
OK
YES
OK
YES
NO
To Next Page
Loading...
Need help?
General