Display Diagnostics
!
WARNING
To avoid risk of electrical shock, personal injury or death; disconnect power to oven and discharge capacitor
before servicing, unless testing requires power.
22
16023463
©2006 Maytag Services
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 failure
Replace Power Board
Err2
Hardware problem
Replace Power Board
Replace Keyboard
Err3
Hardware problem
Replace Power Board
Replace Keyboard
Err4
Wrong jumper setting
Check cable to Power Board
Err5
Shorted keypad
NOTE:
If Touch Panel is pressed for more than 30 seconds, error code
Err5
displays.
1. Disconnect oven from power supply.
2. Disconnect side touch panel connector from display board (J5).
3. Reconnect oven to power supply.
4. If
Err5
reappears after 30 seconds, replace top touch panel.
5. If
Err5
does not reappear after 30 seconds, replace side touch panel.
Err6
Options scrambled
Replace Power Board
Err7
Problem with RTD
Additional info displayed
Err7
0
0
– Uncalibrated
Replace Power Board
Err7
1
1
– Shorted
Check RTD, connections and J8 cable on HV Board
Err7
2
2
– Open
Check RTD and connections
Err8
Over temperature
Inform Customer to press STOP/RESET Twice
Check Triac (TR2)
Check that Relay (K3) is cycling (Convection HTR)
Err9
Over temperature
Current < 2 amps
Check Thermal Limiter
Check Triac (TR2)
Check that Relay (K3) is cycling (Convection HTR)
HOT
Over temperature
(During Cook Time)
See Important Notes Section
Check Magnetron TCO
HOT
Remains in the display
Check harness from H.V. Board J8 to TCOs:
Short together J8-3 to J8-4:
If
HOT
error clears, check or replace cable. If
HOT
error remains, replace
H.V. Board.
