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Wolf M Series Troubleshooting Manual

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Troubleshooting
TROUBLESHOOTING
This section of the manual contains troubleshooting information which will help the Certified Service Technician trou-
bleshoot a Wolf M-Series Wall Oven. The table of contents below shows how the troubleshooting section is laid out.
Glossary
GUI
Graphic User Interface - 7" display.
UIM
User Interface Module – used interchangeably with UIP and Control Panel.
UIP
User Interface Panel – electronics board behind control panel. Contains the main processor board.
PCM
Power Control Module - relay board
HVM
High Voltage Microprocessor on the relay board
LVM
Low Voltage Microprocessor on the relay board
RTD
Resistance Temperature Detector - oven temperature sensor
TCO
Thermal Cut Out – A mechanical temperature limiting device
DLB
Double Line Break – Safety relay system that disconnects both sides of an element
MDL
Motorized Door Lock
EOC
End of Cycle
TOD
Time of Day
POST
Power On Self Test - test performed by the UIP when power is supplied/returned to the relay board.
NOTE: Not all components can be tested. In those instances the component most likely to cause the fault is
replaced. When problems reoccur a deeper look into the root cause is necessary. External factors may also be the
cause when faults reoccur.
830805 - Rev. A - January, 2022
M Series Wall Oven (SWS #22605000)
4-2

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Summary of Contents for Wolf M Series

  • Page 1 TROUBLESHOOTING This section of the manual contains troubleshooting information which will help the Certified Service Technician trou- bleshoot a Wolf M-Series Wall Oven. The table of contents below shows how the troubleshooting section is laid out. Glossary Graphic User Interface - 7” display.
  • Page 2 M Series Wall Oven (SWS #22605000) Troubleshooting Diagnostics Entering Diagnostics (See Figure 4-1A and 4-1B) 1. From Idle mode touch any place on the Graphic User Interface (GUI) and the main menu will appear. 2. Touch SETTINGS. (Continued) Figure 4-1A Transitional Main Menu Figure 4-1B Professional Main Menu 830805 - Rev.
  • Page 3 M Series Wall Oven (SWS #22607000) Troubleshooting Entering Diagnostics 1. The SETTINGS menu will be displayed (See Figure 4-2A and 4-2B). 2. Use the pad of your finger to scroll the options until ABOUT is centered on the display (See Figure 4- 3A an 4-3B).
  • Page 4 M Series Wall Oven (SWS #22607000) Troubleshooting Entering Diagnostics 1. Touch ABOUT and the unit information screen will open (See Figure 4-4A and 4-4B). 2. Touch and hold Ok for 10 full seconds and the gen- eral diagnostics screen will open (See Figure 4-5A and 4-5B).
  • Page 5 M Series Wall Oven (SWS #22607000) Troubleshooting Reposition Screen From the general diagnostics screen touch Reposition Screen. A grid will appear on the GUI (See Figure 4-6). 1. Move the pad of your finger along the grid to reposition the display.
  • Page 6 M Series Wall Oven (SWS #22607000) Troubleshooting Faults Tab Fault codes are a four-digit numerical code that indicates the type, scope and specific component exhibiting the fault. First Digit: Fault Code Indicates main type of fault and/or suspected faulty component. Faults will be grouped according to type of fault,...
  • Page 7 M Series Wall Oven (SWS #22607000) Troubleshooting Logging Faults Up to 20 faults can be logged and viewed on the Faults tab. Faults can be cleared manually or from self-correcting. If multiple instances of the same fault are detected the time stamp of the fault will updated to show the last occur- rence.

  • Page 8: Fault Message

    M Series Wall Oven (SWS #22607000) Troubleshooting Relay Board Related Faults Fault Fault Message Test Priority Action 0021 Bake element relay shorted Ohm P1-1 to P1-4. If continuity P1-1 to P1-4, replace the relay board. 0022 Bake element relay shorted Ohm P5-1 to P5-4.
  • Page 9 M Series Wall Oven (SWS #22607000) Troubleshooting Fault Fault Message Test Priority Action 0931 Upper right convection fan triac Back pin J5-4 and test for See Procedure D. shorted voltage to ground with con- vection fan off. 0932 Lower right convection fan triac Back pin J6-5 and test for See Procedure D.
  • Page 10 M Series Wall Oven (SWS #22607000) Troubleshooting Fault Fault Message Test Priority Action 1421 Upper left convection element relay Back pin P3-6 and test for If no voltage, replace the open. voltage to ground with left relay board. convection element ener- gized.
  • Page 11 M Series Wall Oven (SWS #22607000) Troubleshooting Fault Fault Message Test Priority Action 1B21 Upper cooling fan triac shorted See Procedure D. Back pin J5-6 and test for voltage to ground with cooling fan off. 1B22 Lower cooling fan triac shorted See Procedure D.
  • Page 12 M Series Wall Oven (SWS #22607000) Troubleshooting Fault Fault Message Test Priority Action 2820 Relay board MDL relay circuit fault Relay board internal MDL See Procedure A. relay circuit fault. Not able to test. 2930 Relay board conversion circuit fault Relay board internal conver- See Procedure A.
  • Page 13 M Series Wall Oven (SWS #22607000) Troubleshooting Fault Fault Message Test Priority Action 3311 Upper TCO open See Procedure I. 1. Have environmental issue corrected. 2. Repair wiring or insulation. 3. Replace TCO. 3312 Lower TCO open See Procedure I.
  • Page 14 M Series Wall Oven (SWS #22607000) Troubleshooting Fault Fault Message Test Priority Action 3721 Upper MDL invalid switch position See Procedure F. Repair/replace wiring or replace MDL. 3722 Lower MDL invalid switch position See Procedure F. Repair/replace wiring or replace MDL.
  • Page 15 M Series Wall Oven (SWS #22607000) Troubleshooting Fault Fault Message Test Priority Action 4132 Lower right convection element not Ohm wire from P5-6 to wire If not 22 to 25.6 ohms detected from P6-6. replace convection element. 4231 Upper broil element not detected Ohm wire from P3-1 to wire If not 14.8 to 16.4 ohms...
  • Page 16 M Series Wall Oven (SWS #22607000) Troubleshooting Temperature Related Faults Fault Fault Message Test Priority Action 4910 Upper cooling fan HES stall detect- Cooling fan rotation is not reg- 1. Verify HES harness seated. istering/not rotating. 2. Verify correct relay board.
  • Page 17 M Series Wall Oven (SWS #22607000) Troubleshooting UIP Board Related Faults Fault Fault Message Test Priority Action 6020 UIM RS485 network fault UIM network fault between relay 1. Check RS485 cable and connectors. board and/or UIP or RS485 user’s connection.
  • Page 18 M Series Wall Oven (SWS #22607000) Troubleshooting Knob Encoder Faults - Professional Knobs Fault Fault Message Test Priority Action 7021 Upper mode selector knob input Reseat cable. Replace mode select fault encoder. 7022 Lower mode selector knob input Reseat cable.
  • Page 19 Resistance will be low if there is a short in the circuit. 3. Repair any loose or damaged connections. 4. If open or short appears to be in probe jack contact the Wolf Tech Line at 800.919.8324. Procedure C: Shorted or open RTD Measure Between Point A and B Upper RTD terminals are J2-9 and J2-10.
  • Page 20 6. Flash UIP software. 7. Confirm RTD wiring and element wiring is in good condition and has no shorts. 8. If RTD contact Wolf Tech Line at 800.414.8324. Procedure H: Low Rate of Temperature Rise in Self Clean Low rate of rise in self clean can be from a voltage issue, element issue, software issue, or RTD wiring issue.
  • Page 21 M Series Wall Oven (SWS #22607000) Troubleshooting Procedure I: TCO Open Environmental issues are the major reason for the TCO getting excessively hot and opening. Environment issues should be eliminated first, then proceed to unit issues. Environmental Issues: 1. Ambient temperature near oven is too high. Room temperature near the oven must be below 86° F. Verify heating ducts are not oriented toward the oven.
  • Page 22 M Series Wall Oven (SWS #22607000) Troubleshooting Statistics Tab From the general diagnostics screen touch Statistics tab. A report of unit operation will appear on the GUI (See Figure 4-12). • Power Cycles: The number of times power has been removed from the unit.
  • Page 23 M Series Wall Oven (SWS #22607000) Troubleshooting Control Tab Activating Component - Upper Bake • The upper bake element has been selected. Press Turn On Component. Note the following changes in the GUI (See Figure 4-16). • Requested: Is now Active.
  • Page 24 M Series Wall Oven (SWS #22607000) Troubleshooting Knob Tab - Professional Models Only The Knob tab allows confirmation that the correct mode is selected on mode select encoder, and that the adjust encoder is sending an increase or decrease sig- nal (See Figure 4-20).
  • Page 25 M Series Wall Oven (SWS #22607000) Troubleshooting Main Element Circuit Main element circuit path on the relay board has a redundant DLB system. The bake element and the right convec- tion element share the same L2 source. As does the broil element and left convection element. While each has it’s own DLB only one DLB needs to be closed for each pair elements to complete the L2 circuit path.
  • Page 26 M Series Wall Oven (SWS #22607000) Troubleshooting Auxillary Component Circuit Auxillary component circuit includes MDL, cooling fan, oven lights, and convection fans. Cooling fan, convection fans, and lights use a triac as a driver. MDL uses a relay as a driver. Auxillary component circuit is a 230 VAC cir- cuit and shares on auxillary DLB.
  • Page 27 M Series Wall Oven (SWS #22607000) Troubleshooting Push To Open (PTO) Required Force - Contemporary Models Only The PTO system has a clasp mounted to the door skin, and a latch mounted to the front of the cabinet behind the gasket collar. The force required to push the door in and disengage the PTO is 17 Pounds-Force (lbf), ±4 lbf applied to the center of the stainless steel push bar at the top of the door.