TROUBLESHOOTING
Page 59
Service Manual TDR8 P Gas form 9124023 rev. 01/2022
GENERAL TROUBLESHOOTING LIST
TROUBLESHOOTING FOR THE TDR 8 GAS ROTISSERIES
Symptom
Possible causes
No power to oven controls.
1. Main breaker open.
2. Fuse (125 mA) on power and I/O board burned.
3. Wiring loose.
Main fuse or breaker blows.
1. Wiring incorrectly.
2. Drive motor, blower or contactor switch shorted.
3. Wiring shorted.
Drive motor does not run during
cook cycle.
1. Capacitor malfunction.
2. Power and I/O board malfunction. Also check relay X12.
3. Motor malfunction.
4. Wiring loose.
Drive motor stops and runs again
after a certain period.
1. Thermal protection activated (105°C). This shuts off after the tem-
perature is below 105°C.
Blower motor does not run.
1. Capacitor malfunction.
2. Motor inoperative.
3. Power and I/O board malfunction. Also check relay X6.
4. Wiring loose.
Blower motor stops and runs
again after a certain period.
1. Thermal protection activated (150°C). This shuts off after the tem-
perature is below 150°C.
Oven temperature differs from
temperature setting in program
mode.
1. Safety thermostat malfunction.
2. Blower motor(s) inoperative (turning direction?)
3. Electronic control inoperative.
4. PT-1000-sensor malfunction.
5. Dirty fan guard or fan blade(s).
Oven temperature does not
reach desired temperature in
program mode.
1. Safety thermostat malfunction.
2. PT-1000-sensor malfunction.
3. Electronic control inoperative.
4. Contactor inoperative.
No display and/or keypad does
not function.
1. Main breaker open.
2. Remove plug out of socket and connect plug again (reset of key
sensitivity).
3. Loose flat cable from CPU/display to power and I/O board.
4. Fuse (125 mA) on power and I/O board burned.
5. Power and I/O board malfunction.
6. Loose flatcable from CPU/display to keypad.
7. Keypad malfunction. Check also the adhesive of the keypad.
8. Earth wire on CPU board makes contact with the solder point on
the board (see CPU board page 28).
Blue LED light On/Off key is
fading in and out. Keypad does
not function.
1. Flatcable from keypad on the operation panel is connected incor-
rectly. Must be connected to “Touchpanel 1” connector of CPU
board (see CPU board page 28).
No ignition / no spark (reset light
is burning).
1. Check polarity of plug.
2. Gas burner safety control malfunction.
3. Distance (4 mm/ 1/6”) between ignition pins not in order.
4. Wiring loose.
No ignition of the gas in the bur-
ner (reset light is burning).
1. Reset switch malfunction.
2. Gas supply closed.
3. Gas block malfunction.
4. Gas burner safety control malfunction.
5. Burner control measures wrong speed of gas mixture blower
(change blower). Also see working on page 37.
6. Wiring loose.