21
3
1
Pressure switch fail
Check combustion fan. Check
unit has started and
during heat cycle the
pressure switch has
opened
pressure switch and connections.
Check flue for obstructions
Notes:
The ignition unit is polarity sensitive. If the active and neutral cables are not wired correctly, the unit will not
sense a flame, the green LED will not come on. The heater will light but will turn off almost immediately as a
result.
If the heater lights but the igniter keeps sparking then the unit shuts down after 3 to 5 seconds, incorrect
polarity is a likely cause. The fault code on the module red LED will be 2 long and 1 short.
Before carrying out repairs,
turn off the power
, visually inspect all cables and connections for damage or
corrosion.
On start up, once the unit has passed the self test (and pressure switch is closed on fan forced models) you
should be able to hear a clunk from the gas valve as it opens. If no sound from the gas valve, check
connections. If the valve clunks but no ignition, check gas supply and spark electrode.
On fan forced models, if you suspect a pressure switch fault, you can blow on the input to the switch and
you should be able to hear it switch. If you have a multi meter you can check if the switch is opening and
closing as pressure is applied.
Be certain to turn off the power before disconnecting or checking
switch!
Flash Code Meaning Possible Cause
(Red LED)
Installation Instructions Kemlan Power Flue Horizon Gas Fireplaces
