37
FAULT FINDING
If heater is not working firstly check the following:
Check electrical supply
Check gas pressure
Check gas pressure is a stated in Technical Data
FAULT
CAUSE SOLUTION
No operation
No electrical supply
Check main isolator.
Check supply cables.
Check line fuses.
Check electrical connections
No spark ignition.
Flue venter working
No indication lights on
Differential pressure switch not
working
Check flue pipe and combustion
air pipe are clear
Faulty differential pressure
switch
Replace differential pressure
switch
Poor connection at pressure
switch
Check air pipes
Check electrical connection
Check that the air pipes are
condensate free
Faulty flue venter
Change flue venter
Faulty control box
Change control box
Faulty ionization electrode
Check the electrode is not
cracked or damaged
Check the probe
No ignition
Flue venter not working
No indication lights on
Room thermostat open
Check room thermostat
Faulty flue venter
Change flue venter
Faulty control box
Change control box
Burner lights but cuts out
after 5 seconds
Phase and Neutral inverted
Check polarity of electrical
supply
Faulty ionization probe
Check electrical connection to
the probe.
Check probe
Change ionization probe.
Faulty ignition
Check that the gas type is
suitable for heater
Check gas pressure
Check head pressure.
Check gas supply pipes have
been purged of air.
Explosive start up
Faulty ignition electrode
Change ignition electrode
Incorrect electrode position
Reposition electrode correctly
over the burner bar
Faulty burner tube
Change burner tube
Faulty ignition transformer
Change transformer
