Technical data

NO
15.0 Fault Finding
52
Replace stat.
Wiring from PCB to
thermostats faulty.
YES
NO
YES
NO
Display flashing Ld ?
Disconnect
black stat on flow pipe.
When flow < 60° C, is there
continuity across stat ?
Flow Temperature Overheat Lockout (Ld) or
Fan Temperature Overheat Lockout (LE)
Replace PCB.
Reconnect
stat. Disconnect 9-way
PCB connector. Is there
continuity across T ?
YES
Replace stat.
Wiring from PCB to
thermostats faulty.
YES
NO
YES
NO
Display flashing LE ?
Disconnect
Fan Stat.
When Fan temperature < 60° C,
is there continuity
across stat ?
Replace PCB.
Reconnect
stat. Disconnect 9-way
PCB connector. Is there
continuity across U ?
YES
Are Boot
Lace seals holding door
away from heat
exchanger ?
Trim seals back.
Replace door seals if
damaged.
YES
T
U