Welcome to the RV White Water Retro Travel Trailer Enthusiast Forums!

A website dedicated to all things Riverside RV Retro, tips, tricks mods and more. We have many features on this website to make your experience here more enjoyable.

Join in and contribute your ideas and questions! FYI: You must register and login to post replies or start new topics.


Please consider registering

sp_LogInOut Log In sp_Registration Register

Register | Lost password?
Advanced Search

— Forum Scope —

— Match —

— Forum Options —

Minimum search word length is 3 characters - maximum search word length is 84 characters

sp_Feed sp_TopicIcon
177SE heater repair, ignites but doesn't stay on.
No permission to create posts
April 7, 2018
9:30 am
New Member
Forum Posts: 2
Member Since:
April 7, 2018
sp_UserOfflineSmall Offline

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.

April 5, 2020
12:56 pm
Forum Posts: 23
Member Since:
January 19, 2019
sp_UserOfflineSmall Offline

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.

Forum Timezone: America/Denver

Most Users Ever Online: 177

Currently Online:
7 Guest(s)

Currently Browsing this Page:
1 Guest(s)

Top Posters:

A.J.: 89

Alabama Jim: 54

mrseo12: 42

TanishaLambertson: 23

mkevenson: 22

Perrypridgen: 20

markstevens: 19

thatchick1120: 18

DAVID555: 18

amber_bowers: 17

Member Stats:

Guest Posters: 0

Members: 1142

Moderators: 1

Admins: 1

Forum Stats:

Groups: 5

Forums: 24

Topics: 393

Posts: 1378

Newest Members:

sunvalleyjoe, tisorawawy, mufidysos, Kirsty, meredith, tonghuan, emmajoe, emmawilli, austin, David7865

Moderators: Roccosamore: 119

Administrators: Kristopher: 190