New two stage SureComfort (Rheem) gas ignition issue.

[oldschoolCQ]

Just finished up a complete gas furnace system install with all ductwork. Cannot get the system to light. Fan lit right off when calling for heat bu t never have gotten ignition. Initially had to correct the line in polarit y to correct a 6 blink status led error code and was hoping that would clea r the ignition issue but it still would not light.

Rheem has three LEDs Power(green) Status(green) and Flame(amber). Power an d status stay lit continuous which I believe may mean the board is bad? (

Installed a programable touch screen two stage stat, (Lux) double checked all wiring but, there is one thing I am not 100% sure of: With out AC do I need a wire on "Y" the cooling (AC) terminal? I could not find a wiring diagram for two stage w/no AC and because of that Im thinking it may have been a mistake to go with five wire instead of six , although I can't figure why that would keep it from igniting. >>anyone?

Time is of the essence as I need to get a final in two weeks & this install is the hold up and do NOT want to pay for an HVAC service call as things a re pretty squeaky at our house especially after putting in a heater I was t old initially would NOT be required.

Thanks in advance!

[Tony Hwang]

Hi, No error code? Do you understand the logical sequence of furnace operation? From thermostat calling for heat and furnace going into logical sequence. Lux is POS. First thing is inducer motor coming on, pressure sensor, etc....

[oldschoolCQ]

oldschooCQ here..

Initially had error code of 6 blinks - just the line in polarity.. easy fix.

After that the status light stays on steady and I read a couple posts saying this means a bad board.

Yes I understand the system does a sequential automated check list before allowing for ignition.

All I have gotten is the fan to come on have not seen or heard an attempt by the system to light when calling for heat and it is my belief

that I wont while I have a steady burning status LED.

[Tony Hwang]

Hi, When you say fan I believe you mean inducer motor, blower is not on yet. Blower comes on after ingition. If Iducer motor started, next is pressure check then gas valve opens, then ignition.... If you have multimeter, do some readings with it. Board is quite pricy which will be last thing to try. If it is brand new, no warranty? I am not HVAC expert but being an EE(retired) I know little bit ab out the HVAC control electronics. My main system is Carrier high end one with wireless. It is weird noit being in normal state, there is no error code. Honeywell thermostat.

[oldschoolCQ]

After doing some looking around online I jumped the R (24v) to the W (heat) I did this only after removing the Y (AC) as I have no AC.

Two things: The inducer motor came on and the heat cycle started ( for the first time. Previously only the fan was coming on as apparently the t stat was at issue and the fan was coming on circumventing the start up.

However it does not light and goes into one hour lock out after several tries. I have circumvented the time out so as to hopefully purge the gas line of air. I put it through about 6 trials and it still times out.

Yes I am under warranty but want to trouble shoot all possibilities prior to making a claim.

[Tony Hwang]

Hi, If you have only furnace you need G, W1, W2, R, Rh(Rc) Hooking up Y is irrelevant. If inducer came up and running chamber pressure sensor should make to go to next sequence. You can bypass it for testing or measure the state of the switch which is NO.(closes when draft chamber pressure is OK). Often the little pressure hose, usually clear plastic about 1/4" hose can be plugged up with debris. Time out will occur at any stage if it takes too long to go to next sequence. If you have block diagram there you will see the nomenclature of every major component. Find out where pressure sensor is located and that may be good starting point. Often the sensor is diaphragm type. Pressure hose connects there and will have spade terminals. Good luck.

[Stormin Mormon]

Does the hot surface igniter glow?

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