Reznor Unit Heater Won't Light
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? |
Reznor
Fan comes on?
Tries to lite? Can you hear it ticking? Does it lite at all? |
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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. |
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If it isn't the venter motor or pressure switch, I don't know what it could be? |
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Thanks |
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Success.
It was a build up in the nipple, my guess saw dust. Thanks! |
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If you're making dust in your garage, make a habit of blasting out your heater with compressed air frequently, this is the cause of many a garage fire. I used to have to go and clean out heaters at a truss plant a few times a year as part of their insurance requirements. Shops with lots of woodworking should have dust extraction systems. Having heaters that have their own combustion air piped in prevents igniting dust from the air in the burner/heat exchanger. The exterior of the heat exchanger however, still needs blowdowns.
In most shops where sawdust is an issue I recommend hot water unit heaters, as then there's no combustion taking place in the affected area to ignite anything in the first place. The boiler room would be sealed off from these airspaces. |
OK, here we go again for the 2013 edition of my flipping Reznor! Honestly, I think this is four years in a row I have had to service something to start the season, and it is 12 years old.
Anyway, it calls for heat............the green light flashes and then starts blinking twice. Not a sound.....not a tick, nothing. The venter motor (that is less than a year old) does not start. What else could it be other than the venter motor? Now, late this winter the cap on my exhaust pipe blew off in a storm. I didn't notice that until after the melt when I saw it on the ground. So very possible that water came in through the pipe. Thoughts???? |
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I also fight yearly with an old Reznor. in my Mother-in-laws garage.It is frustrating |
I am looking for a new heater for my shop. Is this a Reznor problem? Or common with garage heaters.
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Perhaps its time to consider some professional help.... :thinking-006:
Sometimes environmental issues such as high humidity or chemical vapors can deteriorate things. I had some drain acid containers leak into the secondary containment tub I had them stored in and it rusted the living heck out of lots of stuff in my garden shed. Often times (as I noted in this same thread, but last year) ducting combustion air directly into the unit can alleviate lots of issues. I've seen condensation build-up in pressure sensor tubing cause havoc. |
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But the venter motor doesn't start. So can I not narrow it down to the venter motor or the motherboard? |
You could check the venter motor by disconnecting the leads to it and powering it directly with some jumpers. Whenever doing such testing be sure to isolate the gas supply. A person can function check a unit component by component, but many things have to happen in a specific sequence so they often cannot simply be jumpered out. I don't want to go into excessive detail on it simply because if I inadvertently omit a detail that's second nature to me, you could easily miss it and the consequences could be bad. When I need a dentist's services I go to one. When someone else needs a licensed, trained journeyman gasfitter they should consider the same.
I've found a number of those units where the fault was actually just a poor connection at a molex connector (multi-pin connection to the motherboard), sometimes at other spots. Sometimes its a bad ground. Etc, etc. |
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