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Combi boiler won't run in room sealed mode

I have a procombi 85HE that runs perfectly - but only if I unclip the front casing to the "burner box" the fan is OK the flame is ok, the air prssure switch is OK (new) the temp sensors have all been replaced (2X NTCs & the High limit) there is no flue blockage, utas sooon as I push teh front panel closed, it cuts out. why wont it run as a room sealed boiler? please reply to thornp@hotmail.com

Posted by Anonymous on

6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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SOURCE: Fan switch will not make (limit switch).

If the snap switch is not located close enough to the plenum, this can be problem. The other option would be to cover the switch area with a metal shield or liatherm paper (fire rtardant paper).

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SOURCE: coleman 90% gas furnace control board stolen

make sure high voltage wiring is correct

Posted on Jan 19, 2009

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SOURCE: Fan and heater run fine but fan does not shut off for a long time

Check the diagnostic indicator.
1. If the blower runs for hours make sure the fan switch on the thermostat is set on "auto".
2. The furnace safety system must be in lockout. This is the furaces way of telling you there is a problem.
3 Most common problem is a dirty flame sensor.

Posted on Mar 08, 2009

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SOURCE: ravenheat he85aaa combi boiler running fault

sounds like low water pressure, check pressure guage, get unit serviced

Posted on Jan 17, 2010

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SOURCE: woke up the other morning with no heating or hot

Per the User's Operating Instructions you want to check the condensate drain. Make sure it is free and clear. Also check the ingnitor, ensure there is no debris or buildup that could prevent it from firing properly.
Also, here are the Installation and Service Instructions that might be of help to you.

Without being onsite with toolbox in hand, I hope this information is very helpful to you. :-)

Posted on Mar 31, 2010

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