HVAC Questions? Ask an HVAC Expert for Answers ASAP
Hi, I'm Douglas and I am here to help you resolve problems with your heating and cooling equipment.
The yellow light is a flame proving light, so it wont come on until there is flame.
Let it attempt to cycle a few times without interuption. Does one of the green LED's blink a code? (1 blink, 2, 3, 4, 5)... there is about a 2 second pause between codes if any.
so the inducer came on with a call for heat, and a while later the blower came on with no fault code? Ok... its probably a failed ingition, it would try 4 times and display a 1 fault.
So thats sounds right so far. But If I am correct the RGVH has a hot surface ignitor, not a spark. The ignitor is by the right burner, does it have an orange wire or two white wires leading to the ignitor?
Ok, I wouldnt try to measure that voltage if its a spark ignitor, its in the 10000vdc range.
Just to be sure, Can you give me the first two letters of the serial number? I want to make sure we are looking a the same control. The RGVH should have had hot surface. I believe you but want to grab the right documents. The first two letters of the serial number will tell me which controls are in it.
Also, there was an RGUH, you are sure it's a V?
I see a DJ which is intermitant pilot, I dont see a DL but all but the DJ were Hot Surface Ignitor. In the DJ, the spark lights a pilot, not the burners directly. Being a 94 model it's definately a RGVH, not a RGUH.
Ok... So is there a pilot light that gets lit every time? If so, is there a 1/4" aluminum tube leading to the pilot?
Ok... so I got the right one. Great, since that was a limited production run, I dont see a schematic.
I hate to ask this, but if you remove the blower door and look on the inside for a schematic, is there a number in the bottom maybe starts 92-????
Hmmm must have been swiped or fell off.
Ok... we'll do our best from here.
The orange wire must lead back to the spark generator. Is this part of the furnace control board or is it a seperate device?
Ok those spark generators dont often go bad, but anythings possible.
If you have a piece of insulated wire, you could attach one end to ground and the other end strip back a 1/4" or so, hold it 1/4" from the needle and call for heat, if after the inducer runs for about 20 seconds on a call for heat, you dont see a spark jump from the needle to the tip of the wire then likely the generator is corrupt (new board). If it does jump, then your ignitor is faulty and is dumping to ground along the orange wire or a cracked or porus ceramic insulator.
If another safety were playing into this, you would get a fault such as 2 blinks on the green or 3 blinks (pressure switch or limit switch).
I think the rollout switches are in series with the main switch. The aux limit in the blower should be breaking voltage to the gas valve if it were opening but that wouldnt turn the spark off.