"HvacTech2" wrote in message
...


Hi Bruce, hope you are having a nice day

On 15-Feb-05 At About 07:59:12, Bruce wrote to All
Subject: York Furnace Problem

B From: Bruce

B I've got a 9 year old natural gas York downflow furnace, with a
B set-back thermostat. I don't have the capacity in front of me, but
B it heats a 5 bedroom house.

B It's been working just fine, until a few months ago. When the
B thermostat calls for heat, sometimes it won't go on. Nothing. If I
B take off the blower cover panel, and press and hold in the momentary
B blower lockout switch, it will go on. When I release the switch,
B it goes off, as it should, since this switch is inteded to turn the
B furnace off when the blower cover panel is removed. I then put the
B panel back on, which depress and holds in the switch (as long as the
B panel is on - which is during normal use), and the furnace goes on
B fine and heats the house to the set tempeerature.

B When the house tempereature drops below the set point, and the
B thermostat calls for heat, 'usually' the furnace goes on. But, when
B it doesn't, I repeat the steps above, and it's comes back on.
B Sometimes it'll go for a week without any failures, but sometimes it
B will fail many times in a row.

B I jumped the thermostat, and tried a new thermostat, and have
B determined this is not the problem.

B To take the blower lockout switch out of the equation, I installed a
B new one, and wired it for always closed, but the same problem
B occurs. If I push and release (sometimes it has to be done
B repeatedly during a failure) the switch, opening and closing the
B circuit, the furnace will come on. It will always come on; sometimes
B one push, sometimes many.

B I had a repairman out (very reputable company), and he suspected the
B control module. A new module was ordered, and a week later another
B fellow brought it out to install it, only to find it was the wrong
B part. Not all bad though, because this fellow isn't all that sure
B that the control module is the problem. He jumped the thermostat
B at the control module, and every time he jumped it there, the
B furnace came on. He thinks maybe a gas control valve, but says that
B the first repairman should be able to nail down the problem.
B Is this true, or is this a 'replace parts until it's fixed' job?

B One more bit of info: I don't remember for certain, but when the
B first repairman was out, I do think there was one or two times when
B he jumped the thermostat at the control module and the furnace didn't
B come on.

B The next time the furnace doesn't come on (tonight), I am going to
B jump the thermostat at the control module and see if it does come on.

B What really has got me stumped is that when it fails, one or more
B pushes on the (new or old) blower lockout switch will make it work.
B Everytime.

B Any ideas?

What is happening is called a lockout. when you remove the door you are
resetting the control. you would get the same result by turning the wall
safety switch off then back on. there is no way to troubleshoot the problem
over the net so you should let the company you called figure it out. they
should be able to do this without changing unneeded parts.


-= HvacTech2 =-


This is Turtle.

If you have read the replys by him and what the techs have said. The service
company has went to Plan B which is just Parts change it to death. If you got a
gas furnace locking out. It usely is not the board doing it and the tech has
said I don't know OK let's change the Board.

TURTLE