Buffalo DC331-N - Page 27

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C. Technical Troubleshooting Guide
Fault
Possible Cause
Remedy
Pilot won’t light.
No gas supply or gas
isolation valve is OFF.
Ensure gas isolation valve is turned on, and
that gas tanks are not empty.
Pilot burner is
clogged/blocked.
Check the pilot burner if clogged, and clean, or
replace if necessary.
Thermocouple connection to
gas valve is loose or too
tight.
Check the thermocouple tightness. Tighten the
thermocouple to 2.5N-m of torque. Or loosen if
necessary.
Faulty thermocouple.
Replace the thermocouple.
Faulty safety gas valve.
Replace the safety gas valve.
Pilot flame is very small
and can be easily
blown out by a small
draft.
Insufficient gas supply
pressure.
Adjust the gas supply pressure to required
standard. Refer to gas pressure requirement
section on this manual.
Thermocouple connection to
gas valve is loose or too
tight.
Check the thermocouple tightness. Tighten the
thermocouple to 2.5N-m of torque. Or loosen if
necessary.
Pilot injector is clogged or
blocked.
Check the pilot burner if clogged, and clean, or
replace if necessary.
Pilot head is partially
blocked.
Check the pilot head for any blockage. Clean or
remove the blockage. Replace the pilot head if
necessary.
Faulty safety gas valve.
Replace safety gas valve.
Main Burner will not
light.
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 and pilot
shuts-off after a few
minutes of operation.
Clogged pilot injector.
Replace pilot injector.
Thermocouple connection to
gas valve is loose or too
tight.
Check the thermocouple connection. Loosen or
tighten if necessary.
Faulty thermocouple.
Replace thermocouple.
Faulty safety gas valve.
Replace safety gas valve.
Flame does not come
out from some of the
holes of the main
burner.
Holes are clogged with
carbon or food debris.
Clean the burner or replace it if necessary.