In the last 4 days I have replaced two Honeywell SV9541 gas valves.
Both were less than 3 years old.
Both were under warranty, but not to me, so I charge a handling fee for
sending a guy to the suppliers to get it, returning to the suppliers
afterwards for the warranty paperwork, the initial call-out charge, and the
labour to install it (Homeowners take note. So much for saving a ton of
money by going with the cheapest bidder! )
Neither customer could get in contact with the installing company, but boy,
did they get a good deal at the time of installation! One customer had
rejected my price when bidding because I was $300 more expensive than the
guy he eventually went with! LOL.
Anyway, be prepared to change a lot of these new and "improved" smart
Thanks Honeywell !!
In both cases, the valve wasn't sending 110 volts to the ventor motor.
Also ,the diagnostic light is steady on, which doesn't match any codes for
it. Normal operation is a green "heartbeat".
I suspect the causes for this will come to light eventually, but for now, I
suspect a faulty internal relay.
Diagnosing whether it's the valve or the board is real simple.
Unplug the three connectors on the valve, and plug them into a new valve,
and just let it hang there, then energize. The ventor should come with a
call for heat.
Bingo! Bad valve.
If its in a 90%er check for condensation. Cold air comes in top, hits
the hot burner, condensation occurs and drips on the gas valve.
Sometimes takes a year but finally shorts out the valve. Causes
erroneous code errors, erratic or no inducer operation.
Good ol Honeywell.
Let me save you some time. I DID some testing. I found that it didnt
matter if the furnace was an 80% or a 90%. I had ones with short
length runs of pvc and long runs. I had some in conditioned basements
and some in cooler basements. Some had the pvc vent pipes running
through unconditioned spaces and others werent. It just really didnt
seem to matter. I saw plenty of whitish streaks and rust marks from
the top of the burner near the pvc intake fitting, down the burner
tray, hitting the roll out switch, down on the gas valve and a mark
running down the inducer onto the blower shelf. I finally broke open a
couple gas valves and found that wonderful condensation white marks on
the board inside the gas valve. Once again proving that electronics
and moisture do NOT mix.
Hell, prob the best was a Bryant var spd inducer that went bad. Took
it apart and sure enough, the board got that same condensation from
the intake above. Bryant fixed that problem though................the
replacement inducer (var spd) actually had a little metal tray built
above the inducer as an assembly (Bryant/Carrier loves "Kits" and
"assemblies"). The tray had a slight angle so the condensation from
the burner would hit the tray above the inducer, run down at an angle
and hit the blower shelf.........missing the electronics.
Laughed my ass off seeing that design. True "customer testing" at its
finest. Gotta love those brilliant Engineers. The customer pays for
everything..........including product testing.
What brand of equipment are you seeing this on? American Standard doesn't
have the gas valve in the outside supply air chamber, and there are no
breaks in the sheet metal to allow condensation to drip on the valve.
I would say its more of a furnace manufacturers design than Honeywell, I
would suggest for your brand you caulk any place that has a potential drip
point above the valve so it can't drip unto it?
Another issue, separate the exhaust from the intake, it sounds like your
bringing back high concentrations of richly moist exhaust back into the
furnace. The Relative humidity is too low to do what your saying its doing,
that moisture is condensing from the re introduction of exhaust gases back
into the furnace.
That is one reason the pipe within the pipe accessory for termination is so
nice, it helps prevent this problem.
Check out http://www.utc.com/ ; then take a look at
http://www.icpusa.com/whocorp.htm ; then take a look at www.carrier.com
[will redirect to corp. website].
I believe, if I'm not mistaken the whole shoot'n match is owned by United
Tech. Corp... actually.
"Bob_Loblaw" < firstname.lastname@example.org> wrote in message
Oscar, I got such a hoot out of your post that I am not going to send
you a keyboard bill. I imagine you have already gotten a bunch of them,
and I don't want you to get your minion insurance revoked, so I'll give
you a break--- this time anyway. Thanks again - I'm still laughing.
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