I installed a new circuit board on the Suburban furnace of my motor home. It comes on, red light comes on fan is blowing

Hi, I'm Robert. Welcome to JustAnswer. I'm reviewing your question now and will post back with your reply momentarily.

IT could be a faulty board if you are not getting spark. I might try a new electrode, if it was a sail switch limit switch problem the gas valve would never open up the board should sending a signal to both the electrode and gas valve at the same time.... I might try and replacing the electrode before another board.

1. Electrode not sparking - with blower running and micro switch engaged, check the following:

a. Check for proper voltage at module board after the blower motor reaches full r.p.m. If no voltage, check continuity through micro switch and limit switch. Also check wiring and wire connections.

b. Voltage is present but no spark at electrode after 12 - 18 second delay, check electrode wire connections.

c. Wire connections OK, but electrode wire does not show continuity through it - replace electrode wire.

d. Electrode wire does show continuity through it - check electrode gap to be sure it is 1/8" maximum between electrode and ground. NOTE: Gap between sensor and ground must be twice electrode gap.

e. Electrode gap OK - check electrode assembly for possible cracks or carbon on tip of electrode.

f. Electrode OK - replace module board

A.Check to be certain that the electrode spark is not sparking against the flame sensor portion of the electrode assembly.

b. Check to be sure module board or high voltage wires are not shorted to the chamber wrapper or other furnace parts.

c.Be sure insulator covering the electrode wire connection on the coil of the module board is in place and insulator behind module board is in place

Hope this helps if you have more questions or concerns please feel free to contact me, if you are satisfied with my efforts please feel free to select a STAR rating on the page.

Robert

Yes you need to verify that gap it is important.

Do you have the serial number of the unit?

Robert

See notes on this...... Click HERE to view.

Suburban Furnace Model NT-30SP Tune-Up Kit comes in two variations. The first (Kit #1) has a single sense electrode (one wire that goes to the electrode, applicable to S/N above###-##-####, the second (Kit #2) has a dual sense electrode (two wires that go to the electrode, applicable to S/N below###-##-####. Please verify which kit is applicable to your furnace prior to ordering.

IF you are satisfied with my efforts please feel free to select a STAR rating on the page.... Robert

Part number for just the electrode is 231933

Robert

No problem at all..

Thanks, Robert