Troubleshooting Flow Chart - Wolf Wall Oven-2 Series Technical & Service Manual

W W a a l l l l O O v v e e n n S S e e r r i i e e s s
W W a a l l l l O O v v e e n n S S e e r r i i e e s s
Step 1. Check Wire Connections (Disconnect power to unit)
Check wire connections J4 and J5 on oven controller to J1
connector of relay board. Unplug both ends and reseat.
Check flex ribbon cable at J11A connector on oven controller,
unplug at oven controller and reseat.
Check wire connections at E1 (L1) and E2 (N) connector on
relay board, unplug both ends and reseat.
Unplug ribbon cable, check for broken or bent pins.
If no broken or bent pins, reconnect ribbon cable.
Step 2. Testing Voltage to Relay Board (Power reconnected to unit)
Check for voltage at E1 (L1)
to E2 (N) on relay board.
Do you have 120 VAC ± 10%?
Yes
Go to step 3
Step 3. Testing Communications
NOTE: Following checks are performed with cables connected unless otherwise noted.
Do you have 36 to 41 VDC
Pins 14 & 17 at J4 or J5
(Controller)? (See Figure 1)
Yes
Do you have 8 to 11 VAC
No
from pins 8 & 9 at J11A
(See Figure 2) ?
Yes
Go to Step 4
Step 4. Testing Oven Controller
Using a volt/ohm meter set to read DC voltage, at J2
Connector of the stepper motor control board, place
one meter probe to pin 1 and one meter probe to pin 2.
With harness connected and unit
turned "OFF", do you have
1 to 3 VDC at J2 from pin 1 to pin 2?
Yes
With harness disconnected and unit
turned "OFF", do you have
4 to 6 VDC between pin 1 & pin 2
of harness?
Yes
Replace Control Head assembly

Troubleshooting Flow Chart

Check for voltage at L1 and N
No
on terminal Block.
Do you have 120 VAC ± 10%?
Yes
Unit has loose or defective wire(s) between L1 of
terminal block and E1(L1) on relay board or N of
terminal block and E2 (N) on relay board.
Repair/Replace wires.
No
Do you have 36 to 41 VDC
Pins 14 &17 at J1
(Relay Board)? (See Figure 2)
Yes
Do you have 4 to 8 VAC between
pins 8 & 9 at J11A (See Figure 2)?
Yes
Replace Comm Cables
Replace oven controller.
No
Replace oven controller.
No
DISCONNECT POWER TO UNIT BEFORE
UNPLUGGING WIRE(S) AND CONNECTIONS
WHEN PERFORMING CONTINUITY CHECKS,
POWER TO THE UNIT MUST BE DISCONNECTED
Check for loose or defective wiring to unit
from terminal block to junction box/power
No
cord. May have to call an electrician.
No Do you have 36 to 41 VDC
at J11A (See Figure 2) from
Pin 1 to pin 2?
No
Replace Control Head Assy.
Replace Control Head Assy.
1 3 5 7
2
4 6 8
Figure 1. J4 and J5 Configuration
12 11 10
Figure 2. J11a Configuration
5-9
Troubleshooting Guide
No
Replace Relay Board
Yes
9 11 13 15 17 19
17
10 12 16 18 20
14
9 8 7 6 5 4 3 2 1
21
22