Thermostat or Boiler Control Board

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Old 11-17-12, 05:44 AM
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Thermostat or Boiler Control Board

I have a WM HE II boiler about 15 years old which I installed used in 2009. It has worked great since then. As the heating season came to Ohio I've noticed the thermostat "clicks on and off" when set around 70 degrees and boiler never actually fires up. The thermostat is by Hunter and requires a battery which we've replaced yearly. If I set the thermostat to 75 or so the boiler works.

So do you think the thermostat needs replaced or it it possible the control panel is gone on the boiler. (as I've read on some other sites)?

Any thoughts would be appreciated.
 
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Old 11-17-12, 05:58 AM
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What make and model is the t-stat?
If the t-stat clicks on and off at 70, it may be too frequent for the aquatstat to engage. Does it do this when set to 69'F or 71?
You noted that you change the batteries yearly, have you changed them recently?
 
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Old 11-17-12, 07:36 AM
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I would be leaning towards the thermostat if it works at 75, but not at 70. Hunter makes great fans, not thermostats.
 
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Old 11-17-12, 07:38 AM
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I've noticed the thermostat "clicks on and off" when set around 70 degrees
Rapidly? i.e. how much time between on and off clicks?

This doesn't sound right... my first suspicion would be the thermostat, but not sure I understand why it would work at 75 and not at 70... that's weird.
 
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Old 11-17-12, 09:57 AM
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This doesn't sound right... my first suspicion would be the thermostat, but not sure I understand why it would work at 75 and not at 70... that's weird.
If the temperature approached 75 in the house it would most likley start doing the same thing.
 
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Old 11-18-12, 03:20 AM
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The thermostat is by Hunter, the same people who make ceiling fans. It is not a digital display, more like the old style with a little arm you adjust the temp with.

As far as batteries, they've been changed recently.

The clicking is fast, just on then off.

One thing I noticed last night when I heard the thermostat "clicking on and off", when to the laundry room where the boiler is and when the thermostat clicks, I can hear something on the boiler click as well, then the thermostat clicks again, I hear it on the boiler as well.

But again, if I set the thermostat higher into the 70s, it runs just fine.
 
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Old 11-18-12, 08:01 AM
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Get a new thermostat. That 'clicking' on and off will likely cause eventual damage to the relays in the boiler.

Hunter t'stats... not so good.

Try a Honeywell VisionPro.
 
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