FAULTFINDING, INSTANTANEOUS WATER HEATERS {BAYARD MODELS) Cont'd.
FAULT
Main burner remains
alight or is slow to
shut off (tipping)
Heat exchanger
noisy
Insufficient water
flow
CAUSE
Gas valve malfunction; dirt or grit
contamination, faulty valve seat etc.
Water section malfunction; dirt or
grit contamination
Scaling of heat exchanger
Excessive gas flow
Insufficient water flow
Water flow restricted
Blocked venturi
Poor water pressure
Malfunction or foreign matter in
water section
Water
temperature
Water flow control fully open
not hot enough
Incorrect gas pressure
-
--- --
-venturi fault
Water
temperature
too hot for
requirements
Gas smell
Water leak
Water governor malfuncti6n
Water flow control retarded
Pilot flame extinguished (knob left
in pilot(*) position)
I ncom pl ete combustion
Gas escaping from appliance or
fittings
Heat exchanger sooted
Thermo-electric valve malfunction
'O'ring's, seals or gaskets leaking
Water connections loose
Pinhole in heat exchanger coil
Water section screws loose
Diaphragm fitted incorrectly
REMEDY
Clean rectify malfunction or replace
valve
Clean, rectify malfunction or replace
De-scale heat exchanger
Adjust gas pressure
Investigate water supply (see below)
Investigate, remove restriction
Clean venturi or replace
Investigate water supply
Cl_ean water section or replace faulty
part
Refer to operating instructions
Check gas pressure, adjust gas rate
Clean or replace venturi
Clean, rectify or replace part
Refer to operating instructions
Check cause of outage, and observe
Chaffoteaux operating instructions
Check ventilation, flue and burner
Test appliance and fittings
Clean, determine cause and rectify
Rectify /replace thermo-electric valve
Replace leaking parts
Check washers, t
i
ghten connections
Repair or replace heat exchanger
Check water section secure screws
Refit diaphragm
ON COMPLETION OF WORK TEST FOR GAS ESCAPES
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