keeprite furnace 6 flashes

[The Cobbler]

CODE: 6 Flashes
RESULT: Failure to ignite or flame sense lost while running.
FIX: Check for: an ungrounded flame sensor; defective hot surface ignitor; low inlet gas pressure; oxide buildup; manual valve shut off; control ground continuity; inadequate flame carryover; or rough ignition.

Brand new furnace installed today by a very busy reputable contractor in a property I'm working at
Furnace fires for maybe 10 or 15 seconds, shuts down and gives 6 flash error code.
contractor spent over an hour on it. replaced flame sensor, checked gas pressures, checked grounds, replaced gas valve, replaced main board.
at 5 pm I said lets leave it ,we've been there since 7am . no heat overnight is fine as house is vacant. He's suggesting he come back tomorrow & replace the furnace & send this one back for warranty .
Not a rant, just a comment on how a day can go for a contractor . Thats it!

 

[rlitman]

Did he check current flow to the HSI, or it’s resistance?

 

[The Cobbler]

He was checking all sorts of things , had a multimeter involved. not sure about the HSI
but it does fire and burn nice , then shuts down

 

[gungatim]

LGR!

 

[The Cobbler]

it's on nat gas. gas line was purged, water heater cycled several times ( gas line is a short run from the heater to the furnace )

 

[The Cobbler]

Update, he was back in today & spent another hour and half on it. tore into the wiring harness , looked for loose connections etc. not sure all what else he did
ended up replacing the furnace . all is like it should be now.

 

[Jim greengo]

Well that *****!

 

[BD1]

Wow !! I had similar circumstance. Replaced the limit switches.


Sent from my iPhone using Tapatalk

 

[Showkey]

Sometimes the next largest component swap is the quickest and most cost effective solution. In this case the entire unit.

Because 8-10 hours of trouble shooting and part replacing can easily cost more than the wholesale cost of the unit. Depending on the model $600-1200 cost ? Plus maybe the supplier will take the unit back ? Or it ends up in the parts bin, or repaired in the shop where the clock is not ticking so loud.

 

[The Cobbler]

.... Plus maybe the supplier will take the unit back ? .....

Yes, he said it will go back, and they will credit him no questions asked. He added that if they ever gave him a hassle on returns, he would go somewhere else to buy. I'm sure no supplier wants to lose a good account , and I suspect he is very respected in that when he says something is bad, it really is.

 

[Jim greengo]

Yes, he said it will go back, and they will credit him no questions asked. He added that if they ever gave him a hassle on returns, he would go somewhere else to buy. I'm sure no supplier wants to lose a good account , and I suspect he is very respected in that when he says something is bad, it really is.

That's the way it normally works.

 

[The Cobbler]

I'm impressed with this company, he called me a bit ago to see if everything was alright .