Jump to content
Click here to check out our structured, online appliance repair training courses for rookies and experienced techs.

FAQs | Repair Videos | Academy | Newsletter | Contact

Stay connected with us...

Subscribe to our YouTube channel for lots of appliance repair tips and help! Subscribe to our MST Radio podcast to learn secrets of the trade. Sign up for our free newsletter and keep up with all things Appliantology.

Morley

Whirlpool 4door refridgerator won't cool

Recommended Posts

Morley

Hi,

I need tour help. I have a whirlpool wrx988sibm01 four door refrigerator. None of fhe compartments are cooling. Compressor isn't coming on.

I checked the compressor (VEGZ 7H) it checks out good. Equal 6.8ohm across all windings/ terminals. No continuity to ground for any of the terminals.

All fans appear to work. As soon as i turn on power

First, icemaker fan comes ON, then condensor fan comes ON, then after a while the icemaker fan goes OFF and top compartment fan comes ON. Then after a while the freezer evaporator fan comes ON. Once the condensor fan turns ON, it stays ON. But the compressor never comes ON.

Then i checked the inverter (W10154805; VCC3 1156 19 A 52):

It is receiving 110v. The control voltage reads 7.14vdc, is it too high. Your video spoke of 4-6vdc for control voltage.

I also checked the output voltage from the inverter. 3 being the bottom terminal in the upside down triangular configuration of terminals and G being ground. (inverter should be putting out 230v 53-153hz), can't tell if this is ac vs. dc and how to measure for this 230v reading, i.e. across which terminals etc. So measure what i could and here are my readings:

G-1 = 167vdc; G-2 = 154vdc; G-3 = 154vdc

1-2 = 317vdc; 1-3 = 317vdc; 2-3 = 0vdc

I looked for current draw on one of the 110v wire coming to inverter, it never went past 0.03Amps, consistent with the low power fans that came ON, but never the compressor.

Now, i am at my wits end, with no path to troubleshoot the issue. Can someone please help.

Thanks in advance to anyone willing and able to help me.

Share this post


Link to post
Share on other sites
Morley

Also there is discoloration on the inverter box to indicate possible heat damage. I checked the pcb as well, no burn spots, damaged or broken leads for installed components on the board.

Share this post


Link to post
Share on other sites
Vance R

The inverter should try to start the compressor there should have been at least 2 or 3 attempts. These would have been kind some current pulses.  Is or was the condenser choked? Condenser fan working? This makes the compressor / inverter work harder and usually burns out the inverter first or it maybe a locked compressor. Your at the point where you need to try a new inverter.

Share this post


Link to post
Share on other sites
Morley

Hi Vance,

I watched the amp meter a couple of time for about 15min straight from power on to see exactly that, ie, to see if the inverter tries to start the compressor, but i didn't see any spike in amps. So concluded it didn't trie to start it. 

Regarding condenser fan, yes it comes on immediately on power on and stays on all through.

I wonder if 7.09-7.14v is too high for control voltage to the inverter. Any thoughts?

This leaves two things for me, i believe,

1. As you said, try another inverter

2. Test the defrost thermistor to see if it working correctly. I am thinking if it stuck on high, the controller may be thinking then its still in defrost cycle so not turning on the compressor by not sending the correct control voltage. Possible?

Share this post


Link to post
Share on other sites
Vance R
1 hour ago, Morley said:

I wonder if 7.09-7.14v is too high for control voltage to the inverter. Any thoughts?

It should have tried to start. Voltage is alittle high, but something should have happened.

1. yes

2. Possible but not very likey. When the refrig has been off for awhile and is room temp inside and outside it will start up when plugged into power.

Share this post


Link to post
Share on other sites
Morley

Hi Vance,

I replaced the inverter today. Good news the compressor turns ON now, however the evaporator coils are still not cooling. Compressor is getting warm/hot, and the small small coming out of compressor and going the condensor coil is warm, while the big tube is staying room temperature. This should be sweating, right.

Condensor fan is running straight out, the inside fan cycle through (icemaker, then top compartment and then the bottom freezer as usual, but not cooling.

What might it be now?

Thanks.

Share this post


Link to post
Share on other sites
Vance R

Compressor running, all fans running, condenser clean. Since this a room temp start so defrost issue possible. Condenser warm, it should be at least 20 degrees over room temp. Time to tap the sealed system and get pressures.

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now

×
×
  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue.