42
Excessive air temperature due
to poor air flow.
Check that the fan blades are
clean.
Check that the horizontal and
(vertical if fitted) louvres are
sufficiently open (see
installation).
Check fan is operating correctly
with sufficient air flow
Faulty thermostat
Change thermostat
Control box will not reset.
Red light illuminated
Faulty flame control module
Change control module check
electrical connections
Fan works intermittently
Faulty FAN operation
Change fan control or SND
thermostat
Insufficient gas pressure
Check that the gas type is
suitable for heater
Check gas pressure
Check head pressure.
Check injector size is correct for
the heater
The fan does not work
Faulty FAN operation
Change fan control or SND
thermostat
Faulty fan
Check fan operation
Check fan motor.
Heater works continuously
without reaching the required
temperature
Heater to small for application
Insufficient gas pressure
Re check heat output required
for application
Check that the gas type is
suitable for heater
Check gas pressure
Check head pressure.
Check injector size is correct for
the heater
Dirty heat exchanger
Clean heat exchanger
