Weil Mclain boiler problem

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Old 01-02-14, 07:26 PM
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Weil Mclain boiler problem

Thermostat stays at 64 and will not move, thermostat is set at 69. Boiler keeps firing on and off.
Tried new thermostat but not the problem. Any suggestions?
The temperature will not rise to were it is set at causing boiler to keep running on and off.
 
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Old 01-02-14, 07:57 PM
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Is your circulator running to pump the water to the heaters. What's the temp of the boiler when it shuts off.
 
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Old 01-02-14, 08:06 PM
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Yes as spott states may be pump or bad relay....
 
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Old 01-02-14, 08:14 PM
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Is the outdoor temp ABOVE 20 BELOW zero?

Depending on the boiler BTU output and the baseboard/emitter BTU output, firing on and off can be normal.

Patrick
 
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Old 01-03-14, 05:13 AM
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Heaters are warm, so possibly relay? Is their a name for this relay and were would it be located?
Temp when I looked was at 155. psi was at 30.
 
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Old 01-03-14, 05:34 AM
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I think that it's a safe assumption to make at this point that your best course of action is to call a technician. In view of the fact that we have some VERY cold weather upon us, now is not the time to attempt a DIY repair to your heating system. There's not enough time to learn what you need to know.

Temp when I looked was at 155. psi was at 30.
If you were reading the correct scale for the pressure - PSI and NOT FEET (there are two scales on most boiler gauges) - and your gauge is accurate, if you really have 30 PSI and your pressure relief valve is not pushing water out, then you have OTHER problems as well...

Get on the phone and start calling for a technician.
 
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Old 01-03-14, 05:38 AM
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You may have a few issues. 30 psi at 155 is to much pressure. Chances are you have an expansion tank issue. 155 is kind of cool for the temps we have in this area now. Can you take some pictures of the system, tell us what the settings are on the aquastat, should be a gray box, look inside. Don't adjust anything until the pros chime in, your at max pressure right now.
 
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Old 01-03-14, 06:11 AM
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tell us what the settings are on the aquastat, should be a gray box,
WARNING! EXPOSED 120VAC INSIDE THAT BOX! YOU CAN BE KILLED! BEFORE REMOVING ANY COVERS, TURN POWER TO BOILER OFF! and VERIFY THAT POWER IS OFF!

your at max pressure right now.
Only if you are reading the correct scale. If you are reading the FEET scale, 30 FEET is equivalent to 13 PSI, which could actually be on the LOW side for 155 temperature.
 
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Old 01-03-14, 06:14 AM
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MPM, in the meantime, at least tell us what MODEL boiler you have?
 
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Old 01-03-14, 07:28 AM
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Called in tech to look at system
 
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Old 01-03-14, 09:26 AM
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Whatever you end up doing, I would say its best to NOT turn down your thermostat at night if you have done that in the past. With the temps out, you don't want to loose the gains you may make during the day.

Patrick
 
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