Troubleshooting an E-22 Error No Heat

Overview

The E-22 “no heat” error code is generated when there has not been a 30ᵒF (17ᵒC) rise in temperature detected by the PMU/GMU board through the main vat temperature probe (J29 connector) within a certain amount of time.

Call Avoidance

1. Ensure the oil level inside the vat is at least at the lower-level indicator line.

2. Ensure the 3-phase power plug is plugged in completely, behind the fryer.

3. Ensure that the 3-phase breaker is not tripped (located in building, not on fryer).

Field Troubleshooting

1. Remove the rear access panel of the fryer to access the contactors and element wires.

   

2. Ensure you have close to 24VDC at A1 and A2 of the coil on the heat contactor when the unit is supposed to heat.

3. Troubleshoot the heat contactor by energizing the heat contactor continuously:

   

   1. Tap Menu Settings.

      

   2. Tap Service.

   3. Enter code 1122.

      

   4. Tap Heat System.

      

   5. Tap Heat Contactor.

   

4. With 24 vdc present at the coil (A1 and A2), check across the heat contactor on each phase to ensure it is closing. When the heat contactor is engaged, you should have 0 vac across all 3 phases (As shown above). If any of the 3 phases show 120 VAC, then the contactor is faulty (open) and should be replaced.

   Refer to Electric Heat Theory of Operation for further explanation of heat system.

   

5. If the contactor checks correctly, there is 208 VAC between all 3 phases (legs) on the outgoing side of the contactor supplied to the element, and the unit does not heat, then replace the heating appropriate element.

   Confirm which element is faulty by checking amperage. It is possible to have more than one faulty element.

   Refer to Electric Heat Sequence of Operation for proper amp draw requirements.

Additional Troubleshooting

1. If a contactor was replaced recently, ensure the coil of the contactor (A1 and A2) was wired correctly. They are polarity sensitive since it is DC voltage.

2. Check the vat main temperature probe for damage, carbon build-up, calibration, etc.