How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site. Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask Kelly Your Own Question
Kelly, Appliance Technician
Category: Appliance
Satisfied Customers: 22923
Experience:  Highly accurate diagnostician with over 30 years experience!
Type Your Appliance Question Here...
Kelly is online now
A new question is answered every 9 seconds

Bosch b26ft70sns/02 compressor not running replaced compressor

Customer Question

Bosch b26ft70sns/02 compressor not running replaced compressor main PC board in back & also inverter for compressor all new condensor fan works though
Submitted: 2 years ago.
Category: Appliance
Customer: replied 2 years ago.
(Posted by JustAnswer at customer's request) Hello. I would like to request the following Expert Service(s) from you: Live Phone Call. Let me know if you need more information, or send me the service offer(s) so we can proceed.
Expert:  Kelly replied 2 years ago.
Thanks for counting on us to help with your appliance problem. My name is ***** ***** I look forward to helping you! Is the inverter getting 120 VAC from line voltage? If so, the issue is likely with the signal from the main electronic control output to the inverter at connector at CN13, red and black wires, to the inverter. Can you check that connection and the voltage between the red and black, looking for about a 5VDC signal, red positive? The service manual for that unit is available for download below.
Customer: replied 2 years ago.
6.5v comming front cn13 & also end of red& black wire plug to inverter 120v comming from brown & blue plug to inverter condenser fan running
Expert:  Kelly replied 2 years ago.
That being the case, the compressor is likely faulty if the inverter has been replaced. Is it getting warm at all?
Customer: replied 2 years ago.
Brand new never used compressor also inverter new checked voltage at comp run start & common no voltage. Doing same thing before I replaced these parts
Customer: replied 2 years ago.
Thought it was compressor in beginning
Expert:  Kelly replied 2 years ago.
New compressor and new inverter and still no compressor running means one of them is bad. The supply and control voltage is there, so one of them is bad.
Customer: replied 2 years ago.
Since there is no voltage at compressor leads I would say inverter what you think?
Expert:  Kelly replied 2 years ago.
The voltage will be a three phase variable voltage so you probably do not have the correct equipment to read it. I would suspect the inverter before compressor, yes.
Customer: replied 2 years ago.
Could I get a voltage reading between either start run or common to ground? Or is there anyway to test inverter with multi meter?
Customer: replied 2 years ago.
I work with commercial compressors alot but this is new to me
Expert:  Kelly replied 2 years ago.
I know of no way to test the inverter output. That is one drawback of that system. The frequency of the voltage is variable, too.
Customer: replied 2 years ago.
If compressor were bad I would get a high amp draw & it would b warm
Expert:  Kelly replied 2 years ago.
If it was starting, or trying to start, yes. The manual shows an overload on that compressor but I think it is part of the inverter. Can you post a picture of the compressor and inverter area?
Customer: replied 2 years ago.
Not till mon I am 100 mi away
Expert:  Kelly replied 2 years ago.
Okay, that would be okay. See if there is a separate overload and we can go from there.