RS2220002 Rev. 0
26
Display Diagnostics
CAUTION
!
All repairs as described in this troubleshooting section are to be performed only after the caution procedures one
through eight listed below have been followed.
1. Check grounding before checking for possible causes.
2. Be careful of the high voltage circuit.
3. Discharge high voltage capacitor.
4. When checking the continuity of the switches or the high voltage transformer, disconnect one lead wire from
these parts and then check continuity with the AC plug removed. To do otherwise may result in a false reading
or damage to your meter.
5. Do not touch any parts of the circuitry on the P.C. Board circuit since static electric discharge may damage this
control panel. Always touch yourself to ground while working on this panel to discharge any static charge in
your body.
6. 208/230 VAC is present in the high voltage circuit board, power relay and primary circuit of low voltage
transformer.
7. When troubleshooting, be cautious of possible electrical hazard.
8. When testing convection operation, convection fan may start at any time or if oven is hot.
Error Codes
During operation, the display may show the following service codes:
NOTE: Before scheduling service for any error codes, instruct customer to unplug oven for 1 minute, reconnect
power, and retest. If unit operates properly, no service call is required.
Display
Description
Corrective Action
Err1
Checksum Error
See note above.
Replace H.V. board.
Err2
Hardware Problem
See note above.
Verify wiring at H.V. board.
If wiring is good, replace H.V. board.
Err3
Hardware Problem
See note above.
Verify wiring at H.V. board.
If wiring is good, replace H.V. board.
Err4
Hardware Problem
See note above.
Check green jumper at J8 connector on H.V.
board.
If jumper is good, replace H.V. board.
Err5
Defective Touch Panel
See note above.
If Touch Panel is pressed for more than 30
seconds, this error code will appear.
Replace touch panel.
Err6
RAM Error
See note above.
Replace H.V. board.
Err7
Error with RTD circuit
If power level shows
0
-
Uncalibrated...................................
1
-
Shorted RTD circuit .......................
2
-
Open RTD circuit ...........................
See note above.
Replace H.V. board.
Check RTD and wiring to H.V. board.
Check RTD and wiring to H.V. board.
HOT
See note above.
Open TCO.
Convection motor inoperative.
Restricted air filter.
H.V. board inoperative.
Broken or loose wire.
Door
Door Interlock Primary Switch
See note above.
Verify latch mechanism moves freely on door.
Verify J1 connector on display board is properly
seated.
Test interlock switch assembly and perform door
adjustment if necessary.
Replace interlock switch assembly if failed.
