Procom QD250T Manual page 22

OBSERVED PROBLEM
ODS/pilot lights but flame
goes out when control knob
is released.
Burner(s) does not light after
ODS/pilot is lit.
Delayed ignition of
burner(s).
Burner backfiring during
combustion.
High yellow flame during
burner combustion.
Gas odor during combustion.
PROBABLE CAUSE
1. Control knob is not fully pressed
in.
2. Control knob is not pressed in long
enough.
3. Equipment shutoff valve is not fully
open.
4. Thermocouple connection is loose.
5. Thermocouple damaged
6. Control valve damaged.
1. Burner orifice is clogged.
2. Burner orifice diameter is too small.
3. Inlet gas pressure is too
1. Manifold pressure is too low.
2. Burner orifice is clogged.
1. Burner orifice is clogged or
damaged.
2. Burner is damaged.
3. Gas regulator is damaged.
1. Not enough air.
2. Gas regulator is defective.
3. Inlet gas pressure is too low.
1. Foreign matter between
control valve and burner.
2. Gas leak. (See Warning
Statement at top of page 21).
22
1. Press in control knob fully.
2. After ODS/pilot lights, keep control
knob pressed in 30 seconds.
3. Fully open equipment shutoff valve.
4. Hand tighten until snug, and then
tighten ¼ turn more.
5. Replace thermocouple.
6. Contact customer service.
1. Burner orifice (see Care and
maintenance Page 20) or contact
customer service.
2. Contact customer service.
low. 3. Contact your gas supplier.
1. Contact your gas supplier.
2. Clean burner (see Care and
maintenance Page 20) or contact
customer service.
1. Clean burner orifice (see Care and
maintenance Page 20) replace.
2. Contact Dealer or Customer Service.
3. Replace gas regulator.
1. Check burner for dirt and debris. If
found, clean burner (see Care and
Maintenance Page 20).
2. Replace gas regulator.
3. Contact your gas supplier.
1. Take apart gas tubing and remove
foreign matter.
2. Locate and correct all leaks (see
"Checking Gas Connections", page
14).
REMEDY