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November 1999 31 COUNTER TOP IMPINGER
TROUBLESHOOTING GUIDE
IMPINGER CTI
SYMPTOM POSSIBLE CAUSE EVALUATION
Incoming Power Supply Check breakers, reset if required Check power plug
to be sure it is firmly in the receptacle (if applicable).
Measure the incoming power, call Power Co., if
needed
Oven Fan Fuses, 5 Amp Check and/or replace
Fuse Holder Check and/or replace
High Limit Thermostat
Control Box (
Note
: High
Limit not used in ovens
S/N 3000352)
Check for voltage on both sides of the switch.
Terminals are normally closed. If open, reset and
test oven for proper operation. If thermostat and
below.) will not hold and control box temperature is
not exceeding 140°F (60°C), replace thermostat.
Fan Switch Check continuity between switch terminals. Check
and insure good wire connections
20 Minute Time Delay Check for supply voltage at terminal #1 to ground on
the 20-minute timer. If no voltage is present, trace
wiring back to power supply. If voltage is present at
terminal #1, check for supply voltage at terminal #2 to
ground. If no voltage is present, and the oven fan
switch is closed, replace the 20-minute timer.
Main Fan Relay Check continuity of coil. Check for power to relay
coil. Visually check for contact pull in and contact
condition. Check for voltage across relay terminals.
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 opens, shorts, or grounds. WARNING
Capacitor has a stored charge, discharge before
testing.
No main fan cool
down
20-Minute Timer Check for supply voltage at terminal #2 and #3 while
main fan is running. Turn off fan switch and supply
voltage should continue to be present for 20 min. at
terminal #2. Replace as needed.
Main fan continues to
run after cool down
20 Minute Timer
NOTE
: On/Off operation of fan switch will reset timer
to 20 minutes. If timer is accidentally reset, turn off
main breaker to cancel. If voltage continues to be
present at terminals 2 and 3 after 20 minutes, verify
fan switch contacts have opened, replace timer as
needed.
Fan Switch WITH POWER OFF: Close switch and check for
continuity across switch terminals.
20 Minute Timer See "Main Fan Motor will not run."
No control box
cooling
Cooling Fan Check for voltages at the fan motor, if present,
replace defective fan motor.