Service Operations - Buffalo CT253 Installation, Operating And Maintenance Instructions

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