April 7, 2018
Just purchased a 2016 177SE and everything checked out except the heater. Previous owner said they never used it.
I removed the front cover, turned on the gas, battery is fully charged. I light the stove above to be sure I had gas and let both burners burn and stabilize. I then turned thermostat to highest setting and watched the heater. Ignitor fired and I could see flame in the box. Then fire went out. This occurred 2 more times and then stopped. I reset the thermostat and tried again. Same issue.
I started checking online and found it to e a common problem with Suburban heaters. The heater is a NT-20SEQ, 20,000 BTU. Probable solution was a replacement module board.
I shut down 12 volts and turned off the gas. I then relit the stove burner until the flame went out. Then I removed 2 screws holding the furnace in place and disconnected the gas line using 2 wrenches to keep from damaging the gas valve. The gas line slid back out of the way and I pulled the furnace out . I made a sketch of the 4 wire connections and disconnected.
With the heater on the bench, I removed the outer case and inspected. No damage anywhere that I could see and all wires were connected.
Another sketch of the PC board wiring and removed the board. The PC board was made by Fenwal and was P/N 23879-002. Kept looking online until I was sure of Suburban’s P/N. One image actually showed the Fenwall part number. Ordered Suburban kit 521099 from Amazon for less than $80.00. Arrived in a couple of days.
Reassembled the heater and added a 4 pin connector between trailer wiring and furnace wiring. I slide heater back in the hole and reconnected gas and wires. Installed the screws that held it in place. Turned on 12 v dc and gas. Relit stove burners to be sure I had gas.
Turned thermostat to maximum and furnace light and stayed on. I let it run for about 10 minutes and installed outer cover.
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