If you were Registered and logged in, you could reply and use other advanced thread options
|
Posted by on February 20, 2007, 4:18 pm
Need help troubleshooting a new installation of a Goodman 70K btu 95%
efficiency two stage gas furnace (Model GMH950703BXA). Brand new.
Replaced old furnace with new. Unit ran fine for about 30 minutes and
then cycled itself off. No flashing diagnostic light until tried three
times and then single diagnostic to indicate three failures and that
gas not being delivered to burners.
Gas pressure fine.
Unit cycles on, blower runs, igniter heats up but after 15 seconds
igniter turns off because flame senses nothing. Not sure why it will
deliver gas to burners anymore. I checked the gas valve while running,
after igniter heats up, I can confirm valve does not open. I know
valve is not the broken because I took valve from another new unit and
still same results. In fact, tried replacing every part except the
combustion fan
The only thing I can think of is that we did not do the direct
venting. While testing, left air inlet as is and combutsion out was
vented to existing flue from old furnace (4" flexible tube).
If venting was the issue, wouldn't the unit at least burn for a time
and then cycle off ? Now cannot get any gas to be released by valve to
the burners. Tried turning off gas, shut off gas valve, shut off
electricity, and re-started everything again, but same results. Tried
4 or five more times.
Any suggestions would help.
|
 
| |
Posted by Speedy Jim on February 20, 2007, 4:48 pm
webneb@hotmail.com wrote:
> Need help troubleshooting a new installation of a Goodman 70K btu 95%
> efficiency two stage gas furnace (Model GMH950703BXA). Brand new.
> Replaced old furnace with new. Unit ran fine for about 30 minutes and
> then cycled itself off. No flashing diagnostic light until tried three
> times and then single diagnostic to indicate three failures and that
> gas not being delivered to burners.
>
> Gas pressure fine.
> Unit cycles on, blower runs, igniter heats up but after 15 seconds
> igniter turns off because flame senses nothing. Not sure why it will
> deliver gas to burners anymore. I checked the gas valve while running,
> after igniter heats up, I can confirm valve does not open. I know
> valve is not the broken because I took valve from another new unit and
> still same results. In fact, tried replacing every part except the
> combustion fan
>
> The only thing I can think of is that we did not do the direct
> venting. While testing, left air inlet as is and combutsion out was
> vented to existing flue from old furnace (4" flexible tube).
>
> If venting was the issue, wouldn't the unit at least burn for a time
> and then cycle off ? Now cannot get any gas to be released by valve to
> the burners. Tried turning off gas, shut off gas valve, shut off
> electricity, and re-started everything again, but same results. Tried
> 4 or five more times.
>
> Any suggestions would help.
>
You tried a gas valve out of another new unit?
Did you try another control board? (Maybe I missed that...)
Does the pressure sensor close after the inducer runs?
I gather this is some temporary setup with venting.
Don't see how that would affect it.
Is the electric service to the furnace control properly
Grounded AND is the polarity correct? (Wh Neutral, Blk Hot)
The control is very sensitive to those conditions.
Jim
|
|
Posted by Stormin Mormon on February 23, 2007, 1:47 pm
Is the gas valve getting power during the ignitor warm up? If so,
you likely have a bad gas valve. If not, I'd look for some notes
about how many amps the HSI draws. I worked on a unit that had a
HSI that glowed nicely, but the amperage draw was wrong. So, the
valve didn't think the HSI was working properly.
--
Christopher A. Young
You can't shout down a troll.
You have to starve them.
.
: Need help troubleshooting a new installation of a Goodman 70K
btu 95%
: efficiency two stage gas furnace (Model GMH950703BXA). Brand
new.
: Replaced old furnace with new. Unit ran fine for about 30
minutes and
: then cycled itself off. No flashing diagnostic light until
tried three
: times and then single diagnostic to indicate three failures and
that
: gas not being delivered to burners.
:
: Gas pressure fine.
: Unit cycles on, blower runs, igniter heats up but after 15
seconds
: igniter turns off because flame senses nothing. Not sure why it
will
: deliver gas to burners anymore. I checked the gas valve while
running,
: after igniter heats up, I can confirm valve does not open. I
know
: valve is not the broken because I took valve from another new
unit and
: still same results. In fact, tried replacing every part except
the
: combustion fan
:
: The only thing I can think of is that we did not do the direct
: venting. While testing, left air inlet as is and combutsion out
was
: vented to existing flue from old furnace (4" flexible tube).
:
: If venting was the issue, wouldn't the unit at least burn for a
time
: and then cycle off ? Now cannot get any gas to be released by
valve to
: the burners. Tried turning off gas, shut off gas valve, shut
off
: electricity, and re-started everything again, but same results.
Tried
: 4 or five more times.
:
: Any suggestions would help.
:
|
|
Posted by on February 23, 2007, 4:59 pm
On Feb 20, 2:18 pm, web...@hotmail.com wrote:
> Need help troubleshooting a new installation of a Goodman 70K btu 95%
> efficiency two stage gas furnace (Model GMH950703BXA). Brand new.
> Replaced old furnace with new. Unit ran fine for about 30 minutes and
> then cycled itself off. No flashing diagnostic light until tried three
> times and then single diagnostic to indicate three failures and that
> gas not being delivered to burners.
>
> Gas pressure fine.
> Unit cycles on, blower runs, igniter heats up but after 15 seconds
> igniter turns off because flame senses nothing. Not sure why it will
> deliver gas to burners anymore. I checked the gas valve while running,
> after igniter heats up, I can confirm valve does not open. I know
> valve is not the broken because I took valve from another new unit and
> still same results. In fact, tried replacing every part except the
> combustion fan
>
> The only thing I can think of is that we did not do the direct
> venting. While testing, left air inlet as is and combutsion out was
> vented to existing flue from old furnace (4" flexible tube).
>
> If venting was the issue, wouldn't the unit at least burn for a time
> and then cycle off ? Now cannot get any gas to be released by valve to
> the burners. Tried turning off gas, shut off gas valve, shut off
> electricity, and re-started everything again, but same results. Tried
> 4 or five more times.
>
> Any suggestions would help.
I had the same problem a coupla months ago with my 90K BTU Goodman 95%
2-stage furnace. The contractor installed the brand new unit, and
after a couple of days the furnace started behaving just like yours
is. I called the guy, he came back, opened up the front cover, looked
inside, but wasn't sure what it was, but somehow got it to work. Over
the next few weeks the problem reoccurred a couple more times, once or
twice it self-healed, but then it wouldn't come back on, so I called
the guy again. The second time, hew finally figured it out, and was
able to fix it. The furnace has been working fine for 4-5 weeks now.
Here's what it turned out to be:
If you remove the front cover, there is a black rubber hose inside,
about 5/8" thick, that is used to remove H20 condesation (from the
exhaust) and drain it out of the furnace (thru a pvc pipe.) Well, this
black rubber hose was originally about 2+ft long(orig. length "out of
the box long"?), so it was "bent and curved" by 180 deg inside the
furnace when installed. There was a section of the hose that was
forming a slight U-shape, and it seems that some H20 was just sitting
in there instead of being drained out. That's at least how the guy
explained it to me, and he thought that, for some reason, was causing
the furnace to go into lockout.
Solution: The guy used a pair of scissors/cutters to trim the rubber
hose to the total length of maybe 10 " and ran it to the drainage
opening (on the right-hand side of the furnace) in a pretty much
straight, slanted line.
I hope I am explaining this clearly enough. I was getting so pissed
and frustrated for a few weeks, and wouldn't want anyone else to have
to go thru the same experience.
Please post an update as to whether you were able to get your furnace
fixed. I'll be very curious.
Good luck!
|
| Similar Threads | Posted | | furnace goodman | October 28, 2006, 1:38 pm |
| Water heater TPR Valve opening at about 160*F? | September 4, 2006, 11:33 am |
| Goodman or Rheem gas furnace? | October 5, 2005, 1:50 am |
| Goodman furnace won't shut off | January 27, 2008, 7:44 pm |
| Goodman Furnace humming and not heating | February 16, 2006, 8:13 pm |
| Goodman GMP075-3 Furnace - Performance Question | February 3, 2007, 7:52 pm |
| Kentucky Goodman Heat Pump/Gas Furnace install | October 3, 2005, 11:03 am |
| Kentucky Goodman Heat Pump/Gas Furnace install | October 3, 2005, 11:03 am |
| Goodman GMV95 furnace + install - price quote | December 30, 2006, 12:52 pm |
| Valve,butterfly valve,ball valve,check valve,globe valve | April 14, 2006, 4:23 am |
|
|
Yahoo! 
Google 
Windows Live 
del.icio.us 
digg 
Netscape 
XML Sitemap