walk in freezer not going into defrost

**2sac** · 10-04-2012, 08:44 PM

To the OP. Slow down. Read your wiring diagrams. They tell you everything you need to know.

**VTP99** · 10-04-2012, 08:59 PM

Originally Posted by ryan1088

Hold on a second, you do refer work too??

Looks like he found the right defrost timer didn't he ?

So I would have to say yes to some degree.

**VTP99** · 10-04-2012, 09:07 PM

Originally Posted by royd2

idk why he wanted to change the dt switch he didnt even test it but if it were bad it would not stop from defrosting would it ? it would just stop from terminating at temo right?

It would not stop defrosting if the timer motor stopped while in defrost yes but most systems have a heater hi limit to stop a melt down form happening. Also if you fan delay/defrost termination failed in the termination mode, it would trigger the defrost solenoid taking it out of defrost mode as soon as it went in.

**ryan1088** · 10-04-2012, 09:24 PM

Originally Posted by supertek65

LMAO!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

I thought you were just a straw boss. Ha.

**Fridge Repairer** · 10-05-2012, 05:23 PM

im going to guess the unit your working on is a very old semi hermetic compressor with weak valves. Let us know what you find Roy

**royd2** · 10-08-2012, 09:33 PM

as it turned out we changed the defrost terminators and the contactors. i think the contactors were sticking keeping the compressor running when it should have shut off

**steve36558** · 10-10-2012, 11:01 PM

Well on some larger systems the heater won't energize till compressor shuts off. Heater relay off aux contacts on compressor contactor. Your post #13 is a good starting point to check.

**steve36558** · 10-10-2012, 11:02 PM

Guages and electric meter will tell your problem.

**timebuilder** · 10-13-2012, 07:55 AM

Originally Posted by steve36558

Guages and electric meter will tell your problem.

I think he fixed it...

Originally Posted by royd2

as it turned out we changed the defrost terminators and the contactors. i think the contactors were sticking keeping the compressor running when it should have shut off

**uniservice** · 10-13-2012, 09:24 AM

So,,,,you changed the DFT, the contacter, and the time clock,,,,,,Which part was faulty, or were all three bad??? I'd have a hard time billing a customer for parts that weren't needed, or maybe that's just me,,,,,,,,