Display Diagnostic - Amana AMH20 Service Manual

Display Diagnostics
To avoid risk of electrical shock, personal injury or death; disconnect power to oven and discharge capacitor
before servicing, unless testing requires power.
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
Err1
Checksum failure
Err2
Hardware problem
Err3
Hardware problem
Err4
Wrong jumper setting
Err5
Shorted keypad
Err6 Options scrambled
Err7 Problem with RTD
Err7 0 – Uncalibrated
0
Err7 1 – Shorted
1
Err7 2 – Open
2
Err8
Over temperature
Over temperature
Err9
Current < 2 amps
Over temperature
HOT
(During Cook Time)
HOT Remains in the display
22
!
W ARNING
!
CAUTION
Replace Power Board
Replace Power Board
Replace Keyboard
Replace Power Board
Replace Keyboard
Check cable to Power Board
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.
Replace Power Board
Additional info displayed
Replace Power Board
Check RTD, connections and J8 cable on HV Board
Check RTD and connections
Inform Customer to press STOP/RESET Twice
Check Triac (TR2)
Check that Relay (K3) is cycling (Convection HTR)
Check Thermal Limiter
Check Triac (TR2)
Check that Relay (K3) is cycling (Convection HTR)
See Important Notes Section
Check Magnetron TCO
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.
16023463
Corrective Action
©2006 Maytag Services