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.
January 19, 2019
Sounds like you have expertise in this area but I would recommend newbies to better to get proper help from HVAC experts. However, if you still want to fix your gas heater issues your own and it is tough for you to get any help then you can get various guide and suggestions from here https://highperformancehvac.com/gas-heating-troubleshooting-and-repair/. Yes, I usually use it to fix minor issues. Again, better to go with the advice of an HVAC expert.
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