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Impinger II – 1100-000-A Series (SN 2038615 & Below) Service Manual –Int’l
6
TROUBLESHOOTING GUIDE
GAS OVENS
1154-000-EA NAT. GAS 230VAC 50 HZ. 1 PHASE
1155-000-EA LP GAS 230VAC 50 HZ. 1 PHASE
REFER TO PROPER SCHEMATIC FOR IDENTIFIED COMPONENTS
SYMPTOM POSSIBLE CAUSE EVALUATION
Incoming power supply Check breakers, reset if required. Check power
plug to be sure it is firmly in receptacle.
Measure incoming power, call power co. if
needed
Fuse, 10A Check, replace if necessary.
Fuse holder Check, replace if necessary.
Hi-limit thermostat, control
box
Check for voltage on both sides of the switch.
Terminals are normally closed. If open, reset
and test oven for proper operation. If
thermostat will not hold, and control box
temperature is not exceeding 140° F (60° C)
replace thermostat.
Main fan switch With power off, Check continuity between
switch terminals. Replace as needed.
Main fan motor Check for opens, shorts or grounds. With
power off, turn fan blade to check for locked
rotor.
Oven fan will not run
Capacitor Check for shorts or grounds.
WARNING: Capacitor has a stored charge,
discharge before testing.
Incoming power supply Check main circuit breakers, reset if required.
Call power co. if needed.
Main fan switch With power off, Check continuity between
switch terminals. Replace as needed.
No control box cooling
Cooling fan Line voltage should now be at the cooling fan.
If voltage is present, check motor for shorts or
opens. With power off, check for locked rotor.
Incoming power supply Check main circuit breakers, reset if required.
Call power co. if needed.
No automatic control box
cooling
Cooling fan thermostat Check the cooling fan thermostat (thermostat
closes at 120° F and opens at 100° F). With the
cooling fan thermostat preheated, check for
continuity. If switch is open, replace thermostat.
Gas supply Check for adequate gas supply and be sure
that manual gas shut off valve is open. Also
check flexible gas line connection.
Main fan If not operating, refer to “Main fan will not run”
Oven will not heat
Gas pressure switch This switch is located inside the gas valve and
should close when gas pressure is present.
WITH POWER OFF: Remove 3 prong plug (on
gas valve) and measure continuity between
terminals 2 and 3. If no continuity, check the
following: Proper gas pressure supply to gas
valve as marked on the oven specification
plate. Check for proper adjustment of gas
pressure switch, 10 for Nat. gas, 27 for LP gas
or 4.5 for town gas. Check the filter in gas
valve for blockage or damage. If above checks
are okay, but pressure switch is still not closed,
replace gas valve.