Garland 40 Series Technical Reference Manual - page 60
Part # GCTRM Rev 3 (12/10/09)
Page 60
Gas Equipment Field Service Troubleshooting Guide
A professional as listed in your maintenance and repair center guide should perform service.
PROBLEM
POSSIBLE CAUSE
SOLUTION
Burner flame soft-lazy tip yellow.
Not enough air mixing with gas.
Open air shutter.
Flame lifts off burner ports. Flashes
back in Burner. Pops excessively when
turned off.
To much air mixing with gas.
Close air shutter.
Delayed ignition.
Unit over gassed or orificed incorrectly
Check gas pressure and orifice size.
Pilot burner will not ignite.
Burner adjusted improperly. Burner
Adjust gas and air mixture.
Burner ports plugged.
Clean burner ports.
Pilot flame too small.
Adjust pilot valve.
Draft in kitchen
Determine cause.
Flame lifts off pilot orifice.
Pilot over gassed.
Adjust pilot valve.
Oven pilot keeps going out.
Faulty thermocouple or safety valve.
Check safety system.
Pilot flame too small.
Adjust pilot valve.
Loose connection on safety valve
Tighten connection.
Main burner blowing pilot out
Adjust gas and air mixture.
Millivolt output low on open circuit
test.
Pilot flame too small.
Adjust pilot flame.
Flame yellow-pilot dirty.
Clean and adjust pilot.
Thermocouple faulty.
Replace.
Millivolt output high on open circuit
test but low on closed circuit test.
Short in magnet.
Replace safety valve.
Millivolt output high on open closed
circuit test but safety valve will not
open.
High millivolt reading on drop out test.
Replace safety valve.
SIT Control
Oven too hot or not hot enough
Control out of calibration
Compensate with a small adjustment
on knob. If not helpful, replace the
control.
Oven too hot or not hot enough
Control out of calibration or bypass
improperly set.
Check calibration and set bypass.
SIT Control
Burner flame shuts off when oven gets
up to temperature.
Non adjustable bypass feature
inoperable
Replace control
Burner flame shuts off when oven gets
up to temperature.
By-pass set too low.
Adjust by-pass.
By-pass set to high causing control to
go into snap action.
Adjust by-pass.
Door will not stay closed.
Not enough tension on springs.
Adjust tension nut clockwise.
Springs broken, hinge link broken
Replace faulty parts.
Door will not stay open.
Too much tension on springs.
Adjust tension nut counter-clockwise.
Door not closing on one side.
Door warped.
Re-stress door.
Doors not level or low in center of unit. Trunion support loose.
Level and tighten support.
Trunion support worn.
Replace.