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Troubleshooting a PR8X
January 17, 2012
1:37 pm
Steve Pooler
Forum Posts: 1127
Member Since:
November 12, 2008
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Hi Rod~

Older PR8X's had a fuse…I guess they decided to save some money in the newer ones…

Try this link: ** you don't have permission to see this link **

Just skip over the test with the jumper/resistor to the one with a plain jumper…

If the pump runs with the plain jumper, then both the PC board & Triac are good.

If you still have troubles after following that troubleshooting guide then come back & tell me where your hung up.



January 17, 2012
12:47 pm
New Member
Forum Posts: 1
Member Since:
January 17, 2012
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I searched the forum but could not find the information I was looking for regarding troubleshooting a PR8X.

This is my first post here so I apologize if I'm not doing it right.

Firstly my PR8X has no fuse, on the box or inside the box.

My water pump power is provided via a 15A circuit breaker on my main 115V panel.

If I jump the the PR8X lug 4 (L1 Output) to the pump directly to the PR8X lug 1 (L1 input) then my A/C water pump works OK, 24/7, controlled by the main panel circuit breaker. Wired correctly it used to work correctly but now the water pump won't run.


I thought the Triac had failed, I purchased a new one, the paper with the Triac shows how to test it with my multimeter. Both the old and the new Triacs show good megohm resistance between MT1 and MT2, when triggered (by my voltmeter) the old Triac shows 65 ohms between MT1 and MT2, the new Triac shows 55 ohms, the paper with the new Triac states the triggered reading between MT1 and MT2 should read 0 to 50 ohms. So my first question is: Are both Triacs good or are both bad?


When I run my A/Cs I see 115+V appear at each trigger as each A/c starts up. I think I see around 25V out of all triggers at the PC Board. I think I see 115+V at the yellow wire terminal gate into the Triac, but the water pump won't start up. Is there a troubleshooting guide available please, that works me through the PR8X trying to figure where I have a problem?


Thanks from Rod