Messages

Subject:
Joe, your gas valve may be suspect
Response To:
Re: OT- furnace update! ()

Tim Greif - West of Chicago
There's no way furnace thermocouples can go bad that often. You may have a weak detector in your gas valve, to the point where it fails to respond to the millivolt output of your thermocouple. You could also have a weak pilot that's not fully heating the thermocouple. Either will cause the furnace to be intermittent. Most thermocouples put out 15-25 millivolts when heated with even a BIC lighter. Most gas valve will register the pilot ok with less than that. On my old Reznor unit heater in my shop (manufactured in 1964), every few years I need to remove and blow out the pilot burner jet assembly with compressed air or I get the same intermittent operation. The flame isn't strong enough to keep the thermocouple covered, and the gas valve drops out when idle. Just a thought.

© 1998 - 2017 by Ellis Walentine. All rights reserved.
No parts of this web site may be reproduced in any form or by
any means without the written permission of the publisher.

WOODCENTRAL, P.O. BOX 493, SPRINGTOWN, PA 18081