Assessments - 2, GPA: 4.5
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Measure incoming power, call power co. if required. Fuse, 10 Amp Check, replace if necessary. Fuse holder Check, replace if necessary. Thermostat, control box hi-limit Terminals are normally closed, open at 130°F (55°C). If open, reset and test for proper operation. If thermostat will not hold, and control box temperature is not exceeding 130°F (55°C), replace thermostat. Switch, oven power Check for line voltage supplied to switch. If no voltage is present, trace wiring back to fuse holder. Check continuity between switch terminals. Replace switch as needed. Motor, main fan Check for line voltage supplied to motor. If no voltage is present, trace wiring back to oven power switch. Check motor for opens, shorts or grounds. WITH POWER OFF: Turn fan blade to check for locked rotor. No control box cooling Incoming power supply Check circuit breaker, reset if required. Check power plug to be sure it is firmly in receptacle. Measure incoming power, call power co. if required. Fuse, 10 Amp Check, replace if necessary. Fuse holder Check, replace if necessary. Switch, oven power Check for line voltage supplied to switch. If no voltage is present, trace wiring back to fuse holder. Check continuity between switch terminals. Replace switch as needed. Cooling fan Check for supply voltage to the cooling fan. If no voltage is present, trace wiring back to the fuse holder. If voltage is present and motor does not run, check motor for opens shorts or grounds. WITH POWER OFF: Check for locked rotor. No automatic control box cooling Incoming power supply Check circuit breaker, reset if required. Check power plug to be sure it is firmly in receptacle. Measure incoming power, call power co. if required. Cooling fan thermostat Check cooling fan thermostat (thermostat closes at 120°F and opens at 100°F). With cooling fan thermostat pre-heated, check for continuity Control box cooling fan continues to run Cooling fan thermostat See “Cooling fan thermostat” (NOTE: Thermostat will remain closed if control box temperature remains above 120°F. Oven will not heat Main fan If not operating, refer to “Oven fan will not run” Air pressure switch Check air switch terminals for supply voltage to terminals NO and COM. If voltage is present on one side only, check for air tube blockage or misalignment. If these are okay, adjust air pressure switch or replace switch as needed. Oven cavity hi-limit thermostat Terminals are normally closed, opens at 660°F (350°C). If open, reset and test oven for proper operation. If thermostat will not hold for maximum temperature, and oven is not exceeding control setting, check for proper location of the capillary bulb in its spring holder. If above checks are okay, replace hi-limit thermostat. Control transformer Check for supply voltage to primary of control transformer. If no voltage is present, trace wiring back to oven power switch. If voltage is present, check for Impinger I -–Adv Digital – Electric Service Manual - International 24VAC at transformer secondary. If there is primary voltage, but no secondary voltage, replace control transformer. Oven control Check for 24VAC supply to oven control. If no voltage is present, trace wiring back to control transformer. Check for supply voltage to oven control. If no voltage is present, trace wiring back to hi-limit thermostat. If voltage is present, check for a read-out on the display. If there is no read-out on the display, replace oven control. If there is a read-out on the display, set the oven control to maximum temperature (see installation operations manual for temperature adjustment). With the oven control at maximum temperature, check for supply voltage to the heat contactor. If there is voltage at the heat contactor, proceed to “Heat contactor “. If there is no voltage at the heat contactor, trace wiring back to the oven control. If there is no voltage output at the oven control, check the read-out on the oven control. If the oven control reads “PROBE FAIL” this indicates that the thermocouple has failed or become disconnected from the oven control Contactor, hi-limit (Model Check for supply voltage to contactor coil. If no voltage 1421-000-E only) is present, trace wiring back to oven cavity hi-limit thermostat. If supply voltage is present at the coil, check to see that contacts are closed. If there is voltage to the coil and the contacts are not closed, replace contactor. Thermocouple Check to see that the thermocouple is securely connected to the oven control. If the thermocouple is connected to the oven control, and the display indicates “PROBE FAIL”, disconnect the thermocouple from the oven control and measure the resistance of the thermocouple. The thermocouple should read approx. 11.. If these readings are not achieved, replace the thermocouple. If these readings are correct, proceed. Oven control If the thermocouple checks good, but the oven control display indicates that there is a thermocouple failure, replace the oven control. If the oven ...
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