Reznor Unit Heater Won't Light

[riden]

I have a REznor unit heater that won't ignite in my garage.

I changed the diaphram and the venter motor. The venter motor was shot, the old one didn't turn on at all.

But it still doesn't ignite. The green light in the board blinks non stop calling for heat and the starts blinking twice.

WHat else could it be?

[Stu]

Fan comes on?
Tries to lite? Can you hear it ticking?
Does it lite at all?

[Kokanee9]

I have a regular furnace in the garage that I had problems lighting for the first time. I had never had it going since I had bought the place.

First problem was that there was a second valve in the house that I didn't know about. Once I had found that, the second problem was that there was air in the line from the house all the way to the garage that needed to be purged out. Once that was accomplished, it ran fine.

Hope this helps.

[fishunter327]

Originally Posted by riden

I have a REznor unit heater that won't ignite in my garage.

I changed the diaphram and the venter motor. The venter motor was shot, the old one didn't turn on at all.

But it still doesn't ignite. The green light in the board blinks non stop calling for heat and the starts blinking twice.

WHat else could it be?

not familier with that heater,but most gas units sequence of operation start with call for heat,combustion blower starts,pressure switch proves ,pilot(or )ignitor)fires ,proves pilot,main flame ignition.Because you have a led light blinking twice ,that is a code for a problem I would say,check the manual for what that indicates.These are somewhat general instructions so good luck.if you post the model # I can look the manual and get a better idea what kind of heater it is.

[riden]

Originally Posted by fishunter327

not familier with that heater,but most gas units sequence of operation start with call for heat,combustion blower starts,pressure switch proves ,pilot(or )ignitor)fires ,proves pilot,main flame ignition.Because you have a led light blinking twice ,that is a code for a problem I would say,check the manual for what that indicates.These are somewhat general instructions so good luck.if you post the model # I can look the manual and get a better idea what kind of heater it is.

Two lights means pressure switch didn't prove. It never clicks.


If it isn't the venter motor or pressure switch, I don't know what it could be?

[Stu]

Originally Posted by riden

Two lights means pressure switch didn't prove. It never clicks.


If it isn't the venter motor or pressure switch, I don't know what it could be?

[fishunter327]

Originally Posted by riden

Two lights means pressure switch didn't prove. It never clicks.


If it isn't the venter motor or pressure switch, I don't know what it could be?

the pressure switch connected to combustion blower by 2 hoses ,am i correct for your model,make sure hoses are on correct location,check the little nipple the hose slips on ,these things get plugged with deposits and won,t let pressure switch get the vacuum it needs.suck and blow on the hose as well and get the pressure switch to operate,sometimes they get sticky from sitting over the summer

[riden]

Originally Posted by fishunter327

the pressure switch connected to combustion blower by 2 hoses ,am i correct for your model,make sure hoses are on correct location,check the little nipple the hose slips on ,these things get plugged with deposits and won,t let pressure switch get the vacuum it needs.suck and blow on the hose as well and get the pressure switch to operate,sometimes they get sticky from sitting over the summer

I will try all these, but this is getting frustrating

Thanks

[fishunter327]

Originally Posted by riden

I will try all these, but this is getting frustrating

Thanks

you can put a jumper wire on the 2 wires on the pressure switch to prove to yourself that this IS the issue.THIS IS ONLY FOR TROUBLE SHOOTING do not leave it there to fix the problem,you are bypassing a safety device.And then you figure out why it isn,t working or use a voltmeter to check for 24volts to ground on both sides of the switch.

[riden]

Success.

It was a build up in the nipple, my guess saw dust.

Thanks!