Question about Paragon 8145-20 Defrost Timer

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I have a unit with a paragon 8145-20ex which is one month old and now the unit will not go into defrost. I thinking it is a problem with the defrost termination limit switch , not the timer. Is there an easy way to bypass that switch at the timer, perhaps by removing a wire? The X?

Posted by diamondic537 on


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SOURCE: install and use Paragon 8145 defrost timer

try the uniline website

Posted on Feb 26, 2010


SOURCE: I have a paragon 8145-20 defrost timer. do you

Link below has wiring diagrams and wiring manuals for 240V 8145-20

I am not expert installing defrost timers.
According to information from Paragon, 8145 is for hot gas defrosting. 8140 series are time initiated, and pressure-or-temperature terminated.
Wiring diagram does not show compressor wired to timer.

The cycle works like this:
Timer is running but defrost is not switched ON.
Fan is ON.
Timer switches ON and activates defrost cycle.
Fan turns OFF. Hot gas valve turns ON for defrosting.
Cycle limit switch is temperature or pressure sensitive.
Cycle limit switch reaches trip point, timer switches OFF.
Hot gas valve turns OFF. Fan turns ON.
So fan is off during defrost cycle.
Hot gas valve turns ON when timer switches ON.
Timer is switched OFF by pressure-or-temperature limit switch.

Posted on Jan 20, 2011

Testimonial: "good info very helpful thank you"



SOURCE: On a Paragon 8145-20 Defrost

Link below has 8145-20 wiring diagram:

Terminal N is 2nd wire needed to complete circuit.
In 240V 8145-20, there are two hot wires.
One Hot connects to terminal 1, with jumper to terminal 2.
Second Hot connects to terminal N, and this will power the clock motor and timer.
Terminal X is for temperature or pressure termination switch.

Defrost cycle works like this:
Timer is running but switched OFF.
Refrigeration fan is ON.
Timer switches ON, defrost cycle begins.
Refrigeration fan turns OFF.
Hot gas defrost turns ON.
When temperature-or-pressure limit switch reaches trip point, it switches timer OFF.
Refrigeration fan turns ON again.
Hot gas defrost turns OFF.

Posted on Jan 20, 2011


SOURCE: What purpose does the solenoid

The solenoid switches timer OFF when temperature-or-pressure limit switch reaches trip point.

Posted on Jan 20, 2011

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1 Answer

Paragon model 8141-00 defrost timer wont turn.

Is this a used timer?
8141-00 is 120 volt timer.
Is your 120 volt Hot wire on terminal 3 and Neutral on terminal X?
Test across 3 and x for 120 volt.

Don't buy used defrost timers... they always look good when you inspect, but never work when connected... that's why the timer was taken out of service and sold as used timer.
Save the old trippers for use on new timer.


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Mar 28, 2015 | Paragon Hardware & Accessories

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How to find

Add comment and describe timer in detail
Paragon 4000 series timer is replaced by Intermatic T100 series:

Paragon defrost timers are shown following link:
Or choose Intermatic defrost timers:


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May 16, 2014 | Paragon 4001-0G Defrost Timer

1 Answer

The unit I'm working on has a 1 month old 8145-20ex and now the unit wont go into defrost - The compressor and the evap do not stop and the heaters do not energize. I'm thinking the defrost termination...

Copy following links:
8145-20 is 240Volt defrost timer.
The defrost cycle will not begin. This implies that trippers are not in place, or trippers are worn out.... or limit switch is stuck ON or solenoid inside timer has gone bad.
Test across terminal N to X for 240Volt. Because voltage here will stop defrost cycle by activating solenoid inside timer, but continuous voltage will also stop next defrost cycle from beginning. Disconnect wire on terminal X and see if defrost cycle will begin at next tripper. If defrost begins, then limit switch is bad.

If you need further help, I’m available over the phone at

Aug 06, 2013 | Hardware & Accessories

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Wiring a defrost timer to a heatcraft condensing unit

Which defrost timer do you have?
Do you have time or temperature termination?
What voltage are you working with?

If you need further help, I’m available over the phone at

Aug 17, 2012 | Paragon 8145-20 Defrost Timer

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I'm looking for a control wiring diagram for this set up; The condenser is on the roof with a paragon 8145-20 in it. I want to control the defrost cycle of the walk in freezer that is downstairs. The...

Open following link to see wiring diagram and manual for Paragon defrost timers:
8145-20 is 240V time-initiated, pressure or temperature terminated, with back-up time termination.

Add a comment for more free help.
Also take advantage of fixya phone service.
For a price, expert speaks with you over phone while you work on timer or any do-it-yourself project.
Fixya is always less expensive than a service call.

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I am looking for a source to replace timer motors and silver contacts on a bunch of paragon 8025 24 hour timers.

According to e-mail I got from Paragon in Nov 2010, Paragon is no longer making timers and parts.
Except for defrost timers.

I don't know how narrow the Paragon defrost line has become, if they still making their commercial refrigeration timers, or if they're just making smaller refrigerator defrost timers.
Or if Paragon has parts for the 8025

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Link below shows Paragon timers

8000 series manual shows 8141-00 is 120Volt:

I am not sure what the suffix b means, and there are always little differences.
The difference could be something simple like knockouts, or mounting bracket.
Wiring and operation should be same since the sell sheet doesn't list 8141-00b as different model.

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1 Answer

I need to get some trippers for my paragon hot water heater timer i believe it is a 4004-20....any suggestions where i might can purchase them....thanks bill

4000 series Paragon timer uses X2772 tripper
To check your model:

Midnight electric sells X2772 tripper

That being said,
According to e-mail I got from Paragon last month, Paragon is no longer making timers or timer parts. Except for defrost timers. 4000 series is not a defrost timer.
This explains why some sellers of these trippers are asking $50 or more for $3 pair of trippers.

To change your timer to Intermatic.
Refer to Intermatic cross reference:

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I think you have the 8145-20 240V
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Paragon 8145 page

Wiring for 8145

Wiring diagram shows both 120V and 240V
L1 L2 is 240V
L N is 120V


Website that explains defrost cycle

Oct 11, 2010 | Paragon 8145-20 Defrost Timer

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