Buffalo CT253 - Service Operations

12. SERVICE OPERATIONS (Gas safe engineer only)
17/22
12.1 TECHNICAL TROUBLESHOOTING GUIDE:
Thermocouple connection to gas
valve is loose or too tight.
Check the thermocouple tightness. Tighten the
thermocouple to 2.5 N-m of torque. Or loosen if
necessary.
Faulty thermocouple.
Replace thermocouple.
Fault
Possible Cause
Remedy
Main Burner
will not ight.
No gas supply or gas isolation
valve is OFF.
Ensure that gas tanks are not empty, and gas
isolation valve is turned ON.
Insufficient gas supply pressure.
Adjust the gas supply pressure to required
standard. Refer to gas pressure requirement
section on this manual.
Clogged or blocked burner
injector.
Clean the burner injector or replace it if
necessary.
Faulty or broken gas valve.
Replace the gas valve.
Main burner shuts-off
after a few minutes of
operation.
Faulty safety gas valve.
Replace safety gas valve.
Flame does not come
out from some of the
Burner flame colour is
yellow.
Wrong gas type used.
Check the gas type used, change to the correct
gas type.
Wrong orifice installed.
Check the orifice installed. Replace it with correct
orifice for the gas type used.
Air shutter is partially or fully
closed. Not enough combustion
Adjust the air shutter of the burner to eliminate
the yellow flame.
Clean the burner or replace it if necessary.
Holes are clogged with carbon or
food debris.
Burner flame is too
high or too low.
Pressure is too high or too low.
Adjust pressure to standard. See standard
pressure settings.
Burner injector used is not
appropriate for the gas type used.
Change the burner injector to match the gas type
used.
Incorrect gas type used.
Change gas type used based on the product's
rating label.
Faulty safety gas valve.
Replace safety gas valve.
Lifting of flames or
Blowing Flames
Too much primary air.
Adjust the air shutter to eliminate lifting of flames.
Wrong size of injector orifice
installed.
Check the orifice size of the injector installed.
Replace injector if necessary.
Yellow tipping of
flames
Lack of primary air due incorrect
air shutter adiustment.
Open air shutters to get rid of yellow flame.
Lint and dust may have blocked
primary air openings or have
a. Clean and re-adjust the burners' air shutter.
b. Replace the burners if necessary.
The burner orifice/injector might
have spun out of line.
Check and re-align the injector to the burner.
Blocked or clogged injector
orrifice
a. Clean and clean the injector orifice.
b. Replace it if necessary.