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FAULT FINDING, INSTANTANEOUS WATER HEATERS (BAYARD MODELS)
This guide should be used in conjunction with the appliance data relevant to the instantaneous water
heater at fault.
FAULT
Pilot not lighting
Pilot will not remain
alight (after control
knob moved to
max./min.position)
Pilot flame poor
Main burner not
lighting
(pilot established)
Explosive ignition
Fluctuat
i
ng and
unstable flames
Yellow flames.
and/
or carboning
of unit
FAULT FINDING
CAUSE
No gas supply
Incorrect operation
Air in gas pipes
.
Pilot filter, injector or pipe blocked
Operating cam or pilot valve fault
No spark at electrode
Weak spark from electrode
Incorrect operation, (premature
movement of control knob)
Incorrect gas pressure or aeration
Thermocouple ma I function,
incorrect flame position
Thermo-electric valve majfunction
Pilot filter, pilot pipe or head
blocked
Pilot injector incorrect, damaged or
partially blocked
Control knob left in pilot position
Water rate
i
nsuffic
i
ent, filter
blocked
Gas valve malfunction; spindle,
valve seating etc.
Water valve malfunction; venturi,
diaphragm, etc.
Pilot flame or the flame direction
incorrect
Main burner tracking and/or
lighting ports blocked
Slow ignition device faulty
Gas escape within appliance
Water in gas supply
Gas valve
malfunction
Water valve
malfunction
Heat exchanger blocked or holed
Primary aeration restricted
Injectors incorrect
Fault in flue system
REMEDY
Check supply at meter and gas cock
Refer to operating instructions
Purge the gas pipes
Replace filter, clean pipe or injector
Replace cam, clean or replace valve
Check piezo, wiring and electrode
Check spark gap or replace electrode
Refer to operating instructions
Check, adjust gas pressure /aeration
Check thermocouple and
connections, also flame position
Replace thermo-electric valve
Replace filter, clean pipe or head
Replace or clean the injector
Refer to operating instructions
Check water rate, clean/replace filter
Rectify malfunction or replace part
Rectify malfunction or replace faulty
part
Clean or replace pilot assembly,
redirect flame direction
Clean out the tracking and lighting
ports
Repair or replace slow ignition device
Locate and rectify gas escape
Clear gas supp
l
y
Rectify malfunct
i
on or replace part
Rectify malfunction or replace part
Clean heat exchanger or replace
Check manifold for restrictions
Replace
i
njectors
Check for flue blockage or incorrect
installation
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