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Old 10-02-2011, 11:11 PM   #1
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Circulator pump wont shut off


Hello,

Wondering if anyone could point me in the right direction?


The Taco 1/25hp pump is connected to a Honeywell R8455A switching relay then to a Honeywell non-prog heat only thermostat. (This is a forced hot water - baseboard heat.)

When I noticed this I pulled the thermostat (faceplate) and that did not work, I then pulled the the 2 wires and that did not work. I eventually disconnected the wires inside the Taco pump.

I ended-up putting that thermostat on another zone and it has not happened. The thermostat I swapped it with (same model) made the problem go away for about 2 weeks. Now it has happened again. ( I have changed the batteries)

Any ideas? Pump? Pump capacitor? Honeywell switch?

Thanks,
Jim

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Old 10-03-2011, 07:27 PM   #2
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Circulator pump wont shut off


Any ideas?

Thanks.,

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Old 10-03-2011, 08:01 PM   #3
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Circulator pump wont shut off


good chance your switching relay is faulty and has a sticking relay.... Which 2 wires did you remove? The 2 to the stat?
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Old 10-03-2011, 09:31 PM   #4
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Circulator pump wont shut off


Yes .. the two wires going to the thermostat.....
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Old 10-03-2011, 09:34 PM   #5
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Circulator pump wont shut off


I would say the relay in the switching relay is sticking.
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Old 10-03-2011, 09:44 PM   #6
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Circulator pump wont shut off


Should I replace the whole unit with the same one or maybe one by Taco?
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Old 10-03-2011, 10:01 PM   #7
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Circulator pump wont shut off


I would use either a honeywell or taco.... I have no preference
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Old 10-05-2011, 09:08 PM   #8
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Circulator pump wont shut off


I email a tech person from Taco and they said to repalce the cartridge in the pump.....what do you guys think about this?

Thanks for all your help.
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Old 10-05-2011, 11:24 PM   #9
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Circulator pump wont shut off


I really doubt it is the cartrige .All indications point to the relay .
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Old 10-06-2011, 07:34 AM   #10
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Circulator pump wont shut off


nope, not the cartridge, the cartridge can only run if it is getting power and that comes from the switching relay. If it wont shut off it means it is getting power when it should not be.
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Old 10-06-2011, 12:11 PM   #11
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Circulator pump wont shut off


The Honeywell tech (online) said to cross the thermostat wires for ten minutes. ??? Did it anyway. It works, but the problem is intermittent anyway...so I wont know if it works

Called to get a price on a replacement and it is $92. Get chilly up here in NH, so I think that Ill get it and replace it the next time it happens.

Thanks for all your help.
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Old 10-25-2011, 09:34 AM   #12
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Circulator pump wont shut off


Back again.....installed a new relay box 2 weeks ago....and get up this morning and that room was 75 degrees.......

Does anyone have any ideas...is it the Taco pump? Or should I just suck it up and call someone?

Thanks again
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Old 10-27-2011, 08:24 PM   #13
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Circulator pump wont shut off


Possible simple things:

You have a mis-wired thermostat. I did this once, the thermostat in the basement was wired to the upstairs zone. Needless to say the basement was cold, kept calling for heat, which was pushing heat to the upstairs zone! Upstairs wouldn't shut off, since the downstairs thermostat was still cold!

You could also have a bad run of thermostat cable. It could have a short which appears to the relay as as close at the tstat.

Also, if you have recently had some maintenance, a zone valve could have been left open after bleeding the zone. depending on how your system is setup, if any zone were to request heat, your trouble zone would always get it as well, since it's valve would be in the open position.

Can you tell if the circ is running? If it is and it's neither of what I said above,you may want to get a pro in there. Does each zone have it's own circ, or do have just one circulator?

Last edited by dougp23; 10-27-2011 at 08:31 PM.
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Old 10-27-2011, 10:09 PM   #14
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Circulator pump wont shut off


Thanks Doug....come on over....10 min from Plaistow....

Anyway......had house insulated and it ended-up being to tight and they ended up putting a fresh air intake on the furnace.....so, yes they did work on the the furnace....and they cleaned it......just remembered......had to redo some of the black pipe to fit the fesh air intake, so I'm assuming they had to drain, etc.........I'll look into that thanks....:-)

I'm thinking its the wire.....I dont know about relays, but why would the circ pimp run when I disconnect the wire from the stat....wouldnt that cause the relay to diconnect and shutoff the pump....

Once again taking the faceplate of the stat...nothing, taking the two wires off the back plate, nothing......going into the relay box and unscrewing one of the stat wires....bing the pump shuts down.......

Yes....one of the stat wires, not one of the power wires???????????////

Thanks for your help.
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Old 10-28-2011, 06:53 AM   #15
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Circulator pump wont shut off


Hey bostonbees!

Just outside of Durham here, how'd you like the snow last night? Was pretty, thankfully didn't add up.

I'm no expert, a true DIY'er who sometimes dives in too deep, lol!

Sounds like a bad stat cable is my GUESS. Get some stat cable (it's cheap), make a new run from the stat to the relay box, just run it out in the open, down stairs around baseboards, under carpets!!

If you don't have an issue with the new cable (and sounds like you'd know pretty quick, the pump wouldn't run as long as set temp was low), then it might be the problem....

Good luck!

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