FIXED Advantium blowing thermal fuse

[Brian Degnan]

Model Number

PSB9240DF1BB

Brand

GE

Age

1-5 years

I have a 240V Advantium Microwave Combo that keeps blowing the thermal fuse that is attached to the magnetron. I've had the microwave for over a year, but it's only been installed for 3 months. The thermal fuse was replaced three times by a technician, and then I decided to look into the cause because it's obviously the symptom of something greater. The thermal fuse blows like clock work if the microwave is on for 2 minutes because the magnetron gets too hot. There exist a squirrel cage fan and damper assembly.

I have never seen the fan turn on. My questions are:
1 Should the fan turn on when the magnetron is running?
2. If not #1, when should it and how does it know.
3. Is it something else entirely?

Any advice would be welcome. I'm currently keeping a stock of thermal fuses. :/

 

[rickgburton]

The circulation motor should turn on and run whenever the microwave is used regardless of time or power level. Check if it's getting 120 VAC when the microwave is in use. If so replace it.

It's out of stock wherever I check: Motor ventilation fan WB27X11017 Order now for same day shipping. 365 day return policy. RepairClinic.com

 

[Brian Degnan]

The circulator motor is not getting 120V. I assume that it's the relay board then. I know that 2 of the other items on the relay board are getting power, so I guess that would point to a bad relay on the board. Things are too noisy to hear the "click". Could you point me at the part number of the relay board?

 

[rickgburton]

I wouldn't "assume" or "guess" anything. Check the voltage and wire connections. Look for a pinched or broken wire. If it never worked it may not be a relay. GE WB27X11018 Relay Board - AppliancePartsPros.com

 

[Brian Degnan]

I traced it to the relay board. The wires were good. Thanks for the warnings thought.

 

[Brian Degnan]

A note here, there's an error in the GE documentation. WB27X11021 is the actual relay board. WB27X11018 is the power board. So, if anyone who reads this thread needs a relay board, be sure it's a WB27X11021.

 

[jeff1]

there's an error in the GE documentation

Nothing new
Thankx for the tip!

jeff.