Hi everyone i been watching this site for quite some time and i love it. I have a problem with my Waterfurnace Envision 3 ton 2 stage it will be running and the contactor that starts the compressor will kick out for a split second and the compressor will shut off and start back up right away, i replaced the contactor and it still does it, it will not do it all the time every once in a while i will hear it cycle off and on real fast. Could it be the freon pressure a little low and cycling the low pressure switch? Any help would be great. I can test alot of the parts myself. I also replaced thermostat. Thanks Pete

I doubt this is related to refrigerant pressure. Is there any change in status lights?

My guess would be pressure swicth (not due to pressure) or wiring glitch. I would first stop replacing parts without foundation (you are muddying the water). Next with power to compressor shut off, wiggle all the wires in control compartment to try to replicate the contactor chatter. Also check low volt connections in auxilliary cabinet. Hopefully this will reveal the trouble.

Good luck,
joe

Before turning off power look to see what error codes are flashing.I would suspect a flow rate problem or some other maintenance issue if this unit has not been recently serviced. You are better off calling out a qualified technician before making problems worse.

Flow rate wouldn't seem to jive with a brief 24v interuption to contactor.
It might trip pressure switch but differential would cause more than momentary interuption.
j

Without the fault codes , we are all just speculating what the problem could be.With the exception of the LP switch all other will lockout the equipment.It could be a defective thermostat or even microprocessor board. There could be loose wiring etc. Call a qualified company or at least post the fault codes.

Thanks for the replies, part of the problem is it won't show a trip code, it is such a fast trip i don't think it has time to bring up a fault. I am going to ck the pressure switches now, made a jumper wire to jump around the pressure switches and am going to see if that works. Thanks

I don't think you are having an actual fault. Hence no code. There is no fault that automatically resets after a second of interuption which was my take on what you meant by start back up right away (yes?).
Do the wire tug (mind high voltage stuff and turn off compressor).
j

Did some more testing and if i would create a low pressure fault the unit would fault but the Emerson Comfort alert would not flash the code. Does anyone ever have one of these units cause that kind of problem that i have? Thanks

Posted By joe.ami on 07 Aug 2011 11:08 AM
I don't think you are having an actual fault. Hence no code. There is no fault that automatically resets after a second of interuption which was my take on what you meant by start back up right away (yes?).
Do the wire tug (mind high voltage stuff and turn off compressor).
j

Do what Joe says. I agree with his reasoning on this.

Or, do as ACWiz suggests and engage a pro.

Apparently we are having 2 different conversations.
I think you are better off hiring help.
j

I like others do not believe its a lockout either but rather it could be a simple configuration issue. What made you replace the contactor?

I am curious where the dip switches are set on SW 3 ( the third set of dip switched from the left ). There are 5 switches on SW3 which ones are ON and which ones are OFF.

plzenk,

Without being present at the unit, it is difficult to determine what the issue might be. We suggest you contact your installing contractor to discuss this matter. If our assistance is needed, please have your contractor contact our technical support staff, as we will be more than happy to work with you and your contractor to resolve this issue.

WaterFurnace International, Inc.

Do you have an open loop with a Taco or similar solenoid valve? I have seen a faulty end switch do this when interlocked with the contactor.

Adam

Hi everyone, thanks for all the helpfull advice. After alot of testing and checking of wires i think i found the problem. The eight pin connector for the thermostat that connects to the circuit board in the unit the Y1 connecter was not making a good connection and it would make the contactor kick out. Now i need to get a eight pin connector to replace the bad one. Any ideas?

Hmm.. Thought that would have a time delay.. Any dealer can source the part for you.

Adam

didn't get a product age perhaps it's under warranty.
did tugging on wires help....?
just reaching for affirmation here :-)