Fault Finding - BENSON RS UHA Assembly And Use Manual

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
No operation
No spark ignition.
Flue venter working
No indication lights on
No ignition
Flue venter not working
No indication lights on
Burner lights but cuts out
after 5 seconds
Explosive start up

FAULT FINDING

CAUSE

No electrical supply
 Differential pressure switch not
working

Faulty differential pressure
switch

Poor connection at pressure
switch

Faulty flue venter

Faulty control box

Faulty ionization electrode

Room thermostat open

Faulty flue venter

Faulty control box

Phase and Neutral inverted

Faulty ionization probe

Faulty ignition

Faulty ignition electrode

Incorrect electrode position

Faulty burner tube

Faulty ignition transformer

37
SOLUTION
Check main isolator.
Check supply cables.

Check line fuses.
Check electrical connections
Check flue pipe and combustion

air pipe are clear
Replace differential pressure

switch
Check air pipes
Check electrical connection

Check that the air pipes are
condensate free

Change flue venter

Change control box
Check the electrode is not

cracked or damaged
Check the probe

Check room thermostat

Change flue venter

Change control box
Check polarity

supply
Check electrical connection to
the probe.

Check probe
Change ionization probe.
Check that the gas type is
suitable for heater
Check gas pressure

Check head pressure.
Check gas supply pipes have
been purged of air.

Change ignition electrode
Reposition electrode correctly

over the burner bar

Change burner tube

Change transformer
of electrical