Lennox Package Unit Model# TGA120S2BH1Y (Gas Heat) NO HEAT

[starkey]

My partner went on a service call for this unit because the heat wouldn't come on. It has 2 boards on it and the board with the indicator light is blinking 3 times. On the unit, it says that if the light is blinking 3 times is is usually flame overthrow but he checked it and it checked out ok. He has ordered a new board but we are hoping someone has info or troubleshooting advice on this unit. We're not too familiar with Lennox units.

[2sac]

What is flame overthrow?

[Mike19]

I think it is rollout. Does that have the manual-reset rollout in it. Where the terminals corroded and not making a good connection?

[2sac]

If that's the case, there is much more that needs to be checked

[carmon]

flame what...... never heard of the term in all my life..... good luck .......

[2sac]

flame what...... never heard of the term in all my life..... good luck .......

Overthrow

[carmon]

oh now I get it .....

[rundawg]

It has 2 boards on it and the board with the indicator light is blinking 3 times. On the unit, it says that if the light is blinking 3 times is is usually flame overthrow but he checked it and it checked out ok.

The 3 flash code - Flame Rollout Switch Open or Prove Switch Open or Closed.

The Flame Rollout is a 290ºf (+/- 12ºf ), manual reset switch.

The Combustion Air Prove Switch closes on negative pressure fall, showing the inducer motor is up to speed before allowing the ignition sequence to continue.

Did you have the door/panel back on burner compartment when you were testing?

Did you do any testing of the combustion blower or it's capacitor?

Sorry, but I don't post manuals in this "OPEN" forum.

[n-e-w Jerz!]

I always check the circuit path from the molex plug connection(s), just because the roll out is closed doesn't mean it's finishing

[timebuilder]

We don't discuss step by step diagnostics in the open forums. Get your post count up to 15 and apply for pro membership, so we can deal with your questions in the restricted access Pro forums.

Even the T series has a wiring diagram. I would follow it and everything should be clear. What is the serial number?

[dandyme]

hell, he's a one & done, apparently didn't get the answer they wanted.

and I'm a little concerned about the "partner" thing?????

[timebuilder]

and I'm a little concerned about the "partner" thing?????

I don't think Louisiana is one of "those" states...

[2sac]

I don't think Louisiana is one of "those" states...

In Loozy they call them "Pardners"