page no. 59 of 68
LX Range Users, Installation & Servicing Instructions Doc Ref M110 issue 1.0 Dec 2020.
3.1 Fault Finding and Status Indication
Colour / State
Fault indication Possible cause of fault
On Steady Standby
1 Pulse APS1 FAULT
Faulty pressure switch, incorrectly set,
incorrectly wired, pick up tube fault.
2 Pulses APS2 FAULT
Faulty pressure switch, incorrectly set,
incorrectly wired, pick up tube fault.
3 Pulses FLAME FAULT
No fuel, faulty gas valve, faulty rectification
probe, incorrect gas pressure, faulty Pactrol.
4 Pulses THERMISTOR FAULT
Faulty thermistor, incorrect software
settings
5 Pulses EXHAUST FAN FAULT Faulty exhaust fan, incorrect wiring
On Steady IGNITION LOCKOUT
No fuel, faulty gas valve, faulty spark/rec
probe, incorrect gas pressure, faulty Pactrol
1 Pulse
HIGH LIMIT 1
(closest to burner)
Incorrect software settings, main air fan
failure, faulty limit stat, incorrect burner rate
2 Pulses
HIGH LIMIT 2
(furthest from burner 90-140)
Incorrect software settings, main air fan
failure, faulty limit stat, incorrect burner rate
3.1.1. Heater LED Indication
Located on the front of the heater
at the bottom right hand corner.
Colour / State
Indication
On Steady High fire runing
Slow Flash Low fire running
Fast Flash Warming up/Shutting down