Hot Water but no house heat

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  #1  
Old 10-29-20, 10:17 AM
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Hot Water but no house heat

We've got a Weil McLain WM97+ (came with the house) that is heating our hot water just fine but not responding to calls for heat from the house. But there are no error messages. The status is "Radiator" but the Modulation bar just sits at 0 for two days straight. Any suggestions for things we can try ourselves before we have to pay some crazy amount for a professional to fix what might be a small problem?
 
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Old 10-29-20, 10:23 AM
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Those temperatures appear like it’s operating. Is the pump running? What’s the model number of the boiler?
 
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Old 10-29-20, 10:43 AM
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Model number is 110. Sorry, I honestly don't know what the pump is (first time homeowner). But there's no action/noise from the boiler unless someone is using hot water, then it jumps awake and starts making noise. The thermostat is obviously set for heat (which was working fine as of 2 days ago) but none of the radiators are heating up.
 
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Old 10-29-20, 11:08 AM
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Welcome to the forums.

That boiler has an integral pump for heating.
Weil McLain WM-97-70-110 (pdf)
 
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Old 10-29-20, 05:06 PM
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Thanks, I own a hard copy of the manual, but obviously it's a ton of information to wade through. I was just hoping someone might suggest one or two things we could try as homeowners before having to resort to calling someone. But I guess we're just going to have to bite the bullet. Just annoying since it feels like this is not something major given that the unit is working just fine to heat all our water.
 
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Old 10-29-20, 05:32 PM
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G,
If you want to try easy and you can find the pump which runs quiet, take a screwdriver and with the t-stat turned up calling for heat put the metal end of the screwdriver on the canister and the other end to your ear, like a stethoscope and you should be able to heare the pump run. If not you may need a new pump or at least a new cartridge. Have someone upstairs at the the stat turning it up and down to while you listen and see if the pump runs. That will give you a starting point anyway depending on your skill level.

Your troubleshooting guide starts on page 107. It's a lot to take in if this is your first time.

Hope this helps a little.
 
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Old 10-30-20, 10:39 AM
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Gbaerod should look at diagrams of system on Page 70 to get basic understanding of his system. Since boiler is heating hot water, lack of room heat is due to failure to circulate it.

https://www.weil-mclain.com/sites/de...t-manual_1.pdf

Figure 80 on page 70 shows typical system diagram, thermostats, circulators, burner.

Because is often difficult to know when small modern circulators are running, connect a small 120 volt AC pilot light to motor black and white wires.

Find wires from room thermostat at boiler circulator #? terminals L & M. When shorted together LM, pilot should light. If it lights and pump/pipes do not get hotter, than pump is bad.

https://www.homedepot.com/p/Taco-Com...07F5/205741246
 

Last edited by doughess; 10-30-20 at 11:22 AM.
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Old 10-30-20, 01:56 PM
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Hi, on the front of that control you can scroll through the programs and see what that boiler is really doing, is there a call for , is it locked out because of outside air temp, thatís a pretty suffocated boiler.
Did it ever work?
Geo🇺🇸
 
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Old 10-30-20, 02:12 PM
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Sorry to misdirect here but what do you mean by suffocated?
 
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Old 10-30-20, 04:11 PM
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Auto correct, should have been sophisticated.
Geo🇺🇸
 
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Old 11-02-20, 08:25 AM
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Thanks everyone. We've got the repairman here now. It was something about the pump and electronics not communicating, so definitely out of our capability to fix. Thanks for weighing in, I appreciate it.
 
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