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Peerless Boiler not staying lit in the mornings

AlexT Member Posts: 23
Hi everybody,

I've got a bit of a stumper for you guys. I don't think I've seen this one posted before. My setup is a Peerless natural gas boiler. It's model # G-561-SP-ID, atmospherically vented, about 20 years old or so. It's got an electronic ignition module in it. It has an electronic vent damper but the wire harness lost a pin so it was disconnected last fall. LWCO is a float type, and the pressurtrol is set to cut in at .5 and cut out at 1.5. The gas valve was replaced a few years ago after it started failing.

So the boiler works fine about 99% of the time. Heats the house great, no leaks, etc. My problem only occurs in the morning when the boiler is getting the house back to normal temperature after being set back. at night When I wake up the house is cold and I can tell the heater isn't working (the radiators are slightly warm, so it did heat for a while at least). I go to the basement and check it out. There is a whiff of gas odor, and I can hear some kind of mechanical noise but there is no flame. I would describe the noise as a buzzing type of noise and you can hear it when the boiler runs normally. I think this is the gas valve, but not sure.

So I switch off power to the boiler, finish my breakfast, and switch the power back on later. It will light up, finish the cycle and have no other issues. This has happened maybe 5 times so far in the past month or so.

My original theory was the LWCO was being triggered by the long cycle so I added some extra water to the boiler. No luck. I've got a plumber coming tomorrow, but he doesn't seem to have a ton of ideas. He suggested calling Peerless but they seem to not publish their phone # anywhere.

Any ideas?


  • nicholas bonham-carter
    nicholas bonham-carter Member Posts: 8,576
    peerless problems

    when you fire it up, test the lwco numerous times, and see if the boiler will shut down, and then restart.

    then turn up the thermostat so the boiler will run for a long time. now take the cover off the pressuretrol, and activate the rocking switch inside to see if that shuts the boiler down. does it restart, following that?

    also check the ignition system for dirt.

    last telephone number i had for peerless tech support was: 612-3693208--nbc
  • Hap_Hazzard
    Hap_Hazzard Member Posts: 2,849
    They have a contact form on their website.


    I haven't found them to be very helpful, frankly. I mean, sure, my boiler is kind of out of warranty, but you'd think they'd appreciate that I'm not too many years away from a new boiler.

    Incidentally, I think a G-561 is a little more than 20 years old. As far as I've been able to tell, they changed the model number from 561 to 61-05 in 1984.

    Do you know what model your gas valve is?
    Just another DIYer | King of Prussia, PA
    1983(?) Peerless G-561-W-S | 3" drop header, CG400-1090, VXT-24
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