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Re: Furnace


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Posted by Stan Coryell on December 21, 2022 at 12:19:03 from (73.196.185.207):

In Reply to: Re: Furnace posted by wore out on December 21, 2022 at 11:33:20:

The valve model number helps.

The gas valve didn't know the pilot lit
(problem with flame sensor or flamesensor
circuit) so the smart valve locked out.
This lock out is the code flashing. It's
possible there is a problem with the valve
also, although I don't think so. The valve
wouldn't have opened when you connected
your meter to it. Manufacturers are pretty
particular about NOT allowing the gas
valve to open until ALL the safety devices
are proved. There is no simple way to
trick a flame sensor since it generates
current.

There is a flow chart in the gas valve
manual that describes the Order of
Operations.

1st,
Disconnect the flame sensor wire from the
valve, place your micro amp meter in
series with the valve and sensor. Let the heater cycle. You
should read between 0.5 (yes point 5) and
10 micro amps withthe pilot lit. I don't really know what it
should be. Honeywell may have it in the
instructions.

If you have less than 0.5, the main valve
will not open. I would be suspicious of a
ground or dirt issue at anything less than
4 or 5 (5, not point 5) micro ohms.

If less than 0.5,
Clean flame sensor with the back of a
knife and check grounds. Re check amps.

If amps are more than 0.5 and the main
valve won't open,
Valve is likely toast. (Your electrical
schematic should verify this)


I would not start changing parts until I
was pretty confident in what was wrong.


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