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Signs of bad pressurestat ??

Postby CSME9 on Tue Jan 18, 2011 12:03 am

Isomac TEA with 3 yr old mater P stat
Power light is on.
Boiler heats up, green and red lights cycle on/off ok.
Drain 5-6 ounces of water thru group and both green & red lights turn off, boiler pressure starts dropping from 1.2 to .06 then red light goes back on and cycles again to 1.2.

Problem started 3 days ago after a boiler and HX descale.

Thanks, WS
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Postby another_jim on Tue Jan 18, 2011 12:29 am

The red and green light are connected to the normally closed and open sides of the same switch. If both go off, that switch is jamming, and the pstat needs to be replaced. This is different from the pressure diaphragm freezing into one position, since that can sometimes be "exercised" back to life.
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Postby Randy G. on Tue Jan 18, 2011 2:10 am

Started after a descale might mean that there is loose scale that worked its way up into the the plumbing of the pressurestat or the diaphragm. mIght try removing it and cleaning it. maybe.
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