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Old 10-24-2019, 09:25 PM   #1
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Default Heat pump/ circuit bord

Anyone with some electrical /hvac experiance give me your 2cents,
( this is my house by the way)
First time switching it over to heat mode since its getting cooler out. Bought this house 2 months ago. So never ran the heat.
Registers wont blow heat, t-stat works wiring is tight, batteries good.
Fan in furnace works, heat pump aint kicking on when it calls for it.
Pumps 19 years old, original in the house...not an issue to replace, but the blue wire doesnt signal live on my tester,
Everthing else seems to have power.
Any thoughs ? Just dont wanna wast 200 bucks on a new pump to find out theres an issue with the electrical.
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Old 10-24-2019, 09:27 PM   #2
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An yes iv ask a sparky an he says he knows nothing about furnaces, and the hvac guy says hes never worked on an air handler..more of an installer i guess.
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Old 10-24-2019, 10:02 PM   #3
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I think that is hydronic heat not a heat pump
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Old 10-24-2019, 10:26 PM   #4
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I barely see hydronic systems here but Ive always been able to figure them out when I have worked on them. Try and post a picture that is a bit more clear of the circuit board and the wiring diagram. When I zoom in on it its blurry
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Old 10-24-2019, 11:39 PM   #5
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is that a circulator pump in the picture? to test the pump just wire it direct to an extension cord and see if it works and then if it does work backwards to any relays or plugs on the board that control the pump...
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Old 10-25-2019, 12:09 AM   #6
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Quote:
Originally Posted by ShtRnsdownhill View Post
is that a circulator pump in the picture? to test the pump just wire it direct to an extension cord and see if it works and then if it does work backwards to any relays or plugs on the board that control the pump...
Definitely a good way to check the pump. Id start by checking for 24 volts coming back from the thermostat w to c on the board. Then check for 120 volts going to the pump out of the relay.

Does the fan come on with a call for heat or only when you switch the fan setting on the stat from auto to on?

On hydronic systems you only get 10-20 temperature rise. So if the house is 60 the outlet air is 70-80 and it feels cold and like its not heating but it actually is.
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Old 10-25-2019, 12:39 AM   #7
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Quote:
Originally Posted by canuck92 View Post
Anyone with some electrical /hvac experiance give me your 2cents,
( this is my house by the way)
First time switching it over to heat mode since its getting cooler out. Bought this house 2 months ago. So never ran the heat.
Registers wont blow heat, t-stat works wiring is tight, batteries good.
Fan in furnace works, heat pump aint kicking on when it calls for it.
Pumps 19 years old, original in the house...not an issue to replace, but the blue wire doesnt signal live on my tester,
Everthing else seems to have power.
Any thoughs ? Just dont wanna wast 200 bucks on a new pump to find out theres an issue with the electrical.
Do you see the screwdriver plug take it out, you may get a little water but not much.

The pump shaft should be slotted, see if it turns, if it does, look for power with your test meter. You should have 120 v on the board and 24 v on the thermostat leads.

Oh, check the thermostat some are battery powered.
You can also try jumping R & W thermostat leads that should make it call for heat.

I for got those mini pumps only last twenty years at best. If it turns bump it with power, sometimes they'll get you through a cold night.

If you replace the pump try to get one rated the same.

Good luck. We all have to learn.
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Last edited by ken53; 10-25-2019 at 12:45 AM.. Reason: remembered more
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Old 10-26-2019, 03:09 PM   #8
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Heres a better pic of circ bord, also thanks for the extension cord idea. Pump works blows hot air. Just saved me $230 and i can return the pump. Might need to get a sparky though
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Old 10-26-2019, 03:22 PM   #9
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Quote:
Originally Posted by canuck92 View Post
Heres a better pic of circ bord, also thanks for the extension cord idea. Pump works blows hot air. Just saved me $230 and i can return the pump. Might need to get a sparky though

geez do you know what a close up picture means??? lol..I still cant see $hit...
take a picture about 12 inches away so we can see components on the circuit board..it sounds like a bad relay , but cant see clearly to tell you what to poke around...looks like the relay upper right corner..turn circuit breaker off and pull the plug off the relay and look for corrosion on plug, try to spray inside relay with an electronics safe lube like corrosion x, there may be corrosion on internal contacts that are preventing pump from coming on..or get part number and replace..
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Old 10-26-2019, 10:10 PM   #10
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I think I have that same heat pump












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