carrier package unit error code

[navyguy1]

Got a Carrier 48GPN030040301. Flashing a 7 code and inducer motor continues to run. Ive pulled the power off and on and it works fine for a day a day or two then its back to the 7 code. High limit? Rollout switch? Ive watched it run through a heat cycle and everything seems good.

Thanks everyone.

[Cool breeze 38]

7 flashes in a roll out fault. page 14 of the install manual.

inducer will run on roll outs and high limit trips. Which way is the wind blowing? is it possibly going straight into the flue discharge.

did you check for a cracked heat exchanger?

[navyguy1]

No wind. Unit same location for years. Checked burners. Observered flame while blower operating. No flame roll out or agitation.
No evidence of cracked heat exchanger.

Thanks

[Snapperhead]

make sure air filters are clean , and look at the "return" grills in ceilings for caked up dust

Ive even seen customers shove their own air filters into the grills then forgetting they are in there

if nothing seen …. replace high limit and roll out …… one of them is going bad , and they are not expensive

[timebuilder]

I was taught many tears ago that the board itself can generate a 7 code, much like the Simplicity board can do with the 9 code.

It's a roll of the dice if you need a rollout...which is cheap to do. For remote locations where I want to make sure the repair is once-and-done, I quote to replace the board, too.

[rundawg]

Got a Carrier 48GPN030040301. Flashing a 7 code and inducer motor continues to run. Ive pulled the power off and on and it works fine for a day a day or two then its back to the 7 code. High limit? Rollout switch? Ive watched it run through a heat cycle and everything seems good.

Thanks everyone.

How old is this unit?

The induced draft motor “wheels” (small squirrel cage) on these are notorious for rusting out and not pulling enough air into the combustion chamber.

Sometimes you can look into the exhaust opening (if the shield is missing or corroded) and see the condition of the wheel.

[timebuilder]

That's a good point. I was assuming that he had already looked at the inducer function......

[icy78]

Possible Burner misalignment.

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[navyguy1]

Ok thanks guys. Ok here’s a possible smoking gun. When the weather was hot the ac would lock out as well. Occupant had to turn it off at the breaker and turn it back on.

[Cool breeze 38]

Ok thanks guys. Ok here’s a possible smoking gun. When the weather was hot the ac would lock out as well. Occupant had to turn it off at the breaker and turn it back on.

is there a phase monitor or any other safety that an be cutting it off? you need to check all voltage and tighten all the connections an be sure your power supply is solid. start there

[navyguy1]

is there a phase monitor or any other safety that an be cutting it off? you need to check all voltage and tighten all the connections an be sure your power supply is solid. start there

No Phase monitor. Ill check the connections. I did blow out the very dirty burner assembly and heat exchanger yesterday. Ill call them and see if its working still. Im leaning toward a bad flame rollout sensor because while it was running I just touched the sensor to see if it was getting hot and it instantly shut down and went into the 7 code.

Thanks for your input

[icy78]

I don't think they go bad without being subjected to abnormally high heat though. It may not be enough to trip it for a few years but enough to weaken it.
So there would still be an underlying problem me-thinks.

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[Bombboy90]

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[Bombboy90]

Check to see if there are any fibers in the inducer wheel. I’ve solved many rollout trips on carriers due to huge fiber build up in those inducer wheels. Remove the inducer and take a small flat head/t stat screw driver and clean the fibers out.

And make sure the burners are aligned. Some carriers techs I’ve noticed tend to use the gas line as leverage and pops the burner manifold up on the far end causing nuisance rollouts.

[Cool breeze 38]

No Phase monitor. Ill check the connections. I did blow out the very dirty burner assembly and heat exchanger yesterday. Ill call them and see if its working still. Im leaning toward a bad flame rollout sensor because while it was running I just touched the sensor to see if it was getting hot and it instantly shut down and went into the 7 code.

Thanks for your input

if you hardly touched it then you need to take a temp reading right at it. its either getting to hot or faulty. the comments about checking the fibers in the inducer wheel is good advice also.

[timebuilder]

Ok thanks guys. Ok here’s a possible smoking gun. When the weather was hot the ac would lock out as well. Occupant had to turn it off at the breaker and turn it back on.

This is not related to heat operation.

A cooling call does not require board activity other than the fan via the IFO terminal on J2, but the Y calls run externally to the board in cooling. The G call invariably passes through to the IFO when present at the board.

So no...the likelihood of these two problems being related is so small that I have never seen it.

The next set of values to be considered is what makes the unit fail in cooling mode. If it is fan related, such as an evap coil freeze up or a high or low pressure lockout due to a CLO board, then you have to identify that cause. In heating, a fan failure would cause the blower compartment limit to open, which is a different heat failure mode than the rollout.


HTH.

[71CHOPS]

one more thing to consider on intermittent trips is to also watch it running with all the panels in place. could be something that only happens with it all closed up.

[navyguy1]

Ok thanks everyone.
As I mentioned I blew out the burner assembly and heat exchanger last Thursday and Friday the occupants said the heating was working again. Probably a bit pre mature but I blew a ton of crud outta the unit so maybe that was the only problem. A few more days and Ill know for sure.

[icy78]

That thing is probably 2 stage? It might be under fired and causing condensation and rust.

Or the return air is too cold or too much outside air making the return are too cold. Or it's a carrier.

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[navyguy1]

Definitely not 2 stage..
From my point of view it’s just a lack of PM. never been cleaned or serviced being installed 10 plus years ago.