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Main fan runs after Oven Start Relay Contacts should open when main fan
20 minute cool down switch is turned off.
20 Minute Time Delay 120 VAC at terminal #2 should discontinue approxi
mately 20 minutes after main fan is switched off. If
the oven start relay contacts are open, and
the voltage continues at terminal #2 of the 20 minute
timer, for more than 20 mins., replace the timer.
Oven Fan Relay Check to insure that the contacts areopening after
the coil is de-energized.
20 Minute Time Delay NOTE: ON/OFF operation of the fan switch
will set the timer to 20 minutes. If the
timer is accidentally reset, turn off main breaker for
15 seconds to cancel.
No control box cooling Check for main fan operation. If not operating, refer
to “Oven Fan Will Not Run”. Oven Start Relay Check relay contacts. 120 VAC
should be present.
Cooling Fan Motor(s) 120 VAC should be present at the fan
motor. If voltage is present, check for opens or
shorts.
WITH POWER OFF: Check for locked rotor of the
fan motor.
No automatic control Thermostat, Cooling Check the cooling fan thermostat. box cooling
Fan (Thermostat closes at 120°F and opens at 100°F.)
With the cooling fan thermostat pre-heated, check for
continuity. If switch is open, replace.
Cooling Fan Motor(s) 120 VAC should be present at the fan motor. If
voltage is present, check foropens or shorts.
WITH POWER OFF: Check for locked
rotor of the fan motor.
Control box cooling fan Thermostat, Cooling This normally open thermostat should
continues to run Fan close at 120°F (48.9°C) and reopen at
100°F (37.8°C).
Oven will not heat Main Fan Motor Check for main fan operation. If it is not
operating, refer to “Oven fan will not run”.
Heat Switch With switch on, check for 120 VAC on
both terminals to neutral. Replace if defective.
Air Pressure Switch This normally open switch should close
when the main fan is activated. Adjust if
necessary (Refer to Section D).
Replace if defective.
Fuse, 3 Amp Check, replace if necessary.
Fuseholder Check, replace if necessary.
Temperature Control Check for 120 VAC supply at
terminal #11 to neutral on temperature
control. If no voltage is present, trace
wiring back to 3 amp fuse. Turn the
temperature adjustment knob to
maximum temperature position and
check for 120 VAC at the load terminal
(#9) and neutral. If 120 VAC is
present and unit is not heating, refer
to “Mercury Contactor” for next check.
If 120 VAC is not present, proceed.
Thermocouple Probe WITH POWER ON AND THERMOCOUPLE
LEADS ATTACHED TO THE TEMPERATURE
CONTROL BOARD: measure D. C.
Impinger II - 1100 Series Service Manual - International38