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Customer Questions and Answers for Relay by Bosch

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Manufacturer Part
4.89 (64)
By: Bosch
Part Number: OEM12225120
Manufacturer Part Number: 00663802

The Relay is an OEM component specifically designed for select Bosch built-in ovens. As a basic electronic switch, it receives signals from the control unit to energize heating elements. 

Durable plastic encapsulation protects delicate components from accidental spills. Precise switching facilitates customized baking and broiling temperatures within close tolerances.

Causes signaling relay failure related to prolonged thermal stresses from consistent oven use. Impacts of electric abnormalities could also cause malfunctions over time.

Symptoms requiring replacement include:  

  • Inability to power top or bottom heating elements during cycles
  • Erratic temperature fluctuations beyond adjustment capabilities
  • Buzzing or loud clicking noises emitting from the relay housing

This OEM Bosch replacement part is also compatible with Thermador, Gaggenau, and select Kenmore built-in ovens employing identical temperature modulation methods. Reinstallation ensures continued customizable and safe cycle performance.
 

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Questions & Answers

For Bosch Relay (Part Number: OEM12225120)

1 Answer

Bob, The board that would be needed is the relay board which is the one on top of the oven box.

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Daniel for Model Number HBL5650UC/06

Top heating element won't heat. I followed the advice below from another anwer: "with the power turned off at the breaker, the unit can be tested at the relay control module 12022214. From relay connection X104 P-8 to X102 P-1, the wires going to the broil element 00144667 should read 16 ohms of resistance. If the resistance checks good, then the control has failed. If the resistance reads as 0 or OL, then either the broil element has failed or there is a broken wire that would need to be repaired. If the resistance reads lower than 16 ohms, the element has failed." Reading was 15.4 ohms, I assumed this is close enough to 16 (or within the accuracy of my multimeter) so I replaced the control board. Still the top element will not heat. I disconnected the element and ensured there is continuity across the element terminals. What should I try next?

1 Answer

Daniel, You will want to test to make sure that there is 240 Vac getting to the element. If there power regardless of the resistance it would indicate that the element is faulty and would need to be replaced. If there is no power then check wiring between the element and the control board.

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1 Answer

John, based on the information provided, the main control 12022213 is not registering the temperature properly and causing the heat to continue to build.

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1 Answer

Charlene, with the power turned off at the breaker, the unit can be tested at the relay control module 12022214. From relay connection X104 P-8 to X102 P-1, the wires going to the broil element 00144667 should read 16 ohms of resistance. If the resistance checks good, then the control has failed. If the resistance reads as 0 or OL, then either the broil element has failed or there is a broken wire that would need to be repaired. If the resistance reads lower than 16 ohms, the element has failed.

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1 Answer

James, The occasional E147 error code is most likely do to an overheat situation. You will need to check the oven temperature sensor resistance at the control board, it should be a resistance of 1050 to 1100 ohms resistance at room temperature. If that's proper, then you'll have to suspect a "stuck" relay on the 12022214 Control Module and it will need to be replaced.

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1 Answer

Hello Gasman, This is normally caused by the double line break relay on the control board 00655356 or a high limit thermostat 00617877, (two of these), getting weak.

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Ralph for Model Number Bosch HBL3350UC

Tried self cleaning cycle on this old (6 years) but rarely used Bosch. Middle Glass blew out about 1/2 hour into the cycle. Hit breaker to turn off oven. We ordered new glass/replaced it. Put it all back together. Turned oven on...seems like we have all functions (fan, clock, temp control, etc) but oven won't heat on any of the three cycles-Broil/Bake/Roast. Looked at sensor.... uncrimped the tube...pulled out wires/harness everything looks fine in the harness. But still no heat.

1 Answer

Ralph, when you hit the breaker during the clean cycle, it shut off the fan that keeps the unit from overheating. You probably tripped the high limit thermal fuse located on the back of the oven. You will need to pull the oven out and re-set the fuse. It has a red button you can press it in to re-set it.

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