Suburban NT30SP problem?

[lancelot50]

Hello im new new to forum glad to be a member! I posted last nite about my furnace but cant find it so if i duplicate i apologize! Ill shorten this one lol.a few winters back the furnace(nt30sp)seemed fine for a day! It was bitter cold.that nite i woke with fan running,cold air no idea how long.checked tanks,ok! Reset thermo furnace started again going thru cycles.when i say cycles im referring to troublesbooting guides normal first steps from thermo set,click,delay,fan,ignite,etc.anyway it repeated same thing fan running no heat.reset start over.next day i filled tanks,replaced tank regulator and hoses.had rv guy come check for 11 inch flow.then it wouldnt re ignite at all after first cycle so i played with igniter and it would intermittent cycle.then when it re ignited it would woosh or ignite loud!. Finally i gave up and used a eden pure heater and wall propane.oh!i did observe the flame thru small window it waz blue but may have been slight lazy.so im recently divorced and sadly my coachmen catalina will be my living quarterz this winter uggh! Im doing quick winterizing so i took furnace ouf.prior to umhooking gas i filled tanks and lif all burnerz on stove.all were crisp blue.on furnace i found combustion housing gasket 1/2 gone! Debris in burner chamber,a golf ball size nest behind c.chamber wheel! Not sure how that wheel comes off? Ill tell you the parfs i ordered based on troubleshooting and basicgaskets.limit switch(fan stays running)combustion gasket(bad)had to cause some symptoms maybe the not igniting or woosh? New igniter(piece of mind and i know how to set)gaskets for igniter,burner access and manifold!(wanted to make sure that area sealed).im sorry this is lengthy but wanted to be informative.i didnt order sail switch as i think blower was running full speed.but i may be diagnosing wrong.i can check with ohm meter on my bench.ill also clean it off and mqke sure it moves free.if anyone has an idea why when the furnace whould ignite it was so LOUD,boom,or woosh! Too much gas! But why? Leaky burner tube? It looks fine and clean.combustion gasket? Faulty igniter? Any help is soooo appreciated! Im also tracking down cheapest water heater.mine froze and busted.parts should be coming thurs or fri.ill check back later if anyone suggests anything i can add to order thanks lance!

[Skip426]

Welcome to iRV2.
Sorry your here with problems .

Don't know if any info from this site will help.
Delayed spark from the control board is my thought, but I'll re-read your post.

Troubleshooting RV Furnace Problems

[lancelot50]

Thanks skip426! Thats a simpler guide! I dont think i have a board issue but im not a tech lol.the furnace seemed to work ok for about a day.although maybe i should have ordered a sail switch!but while its out ill clean grounds and contacts@board!i think my main problem was the delapidated combustion housing gasket,plus nests and debris! Then to add to it i started playing with electrode and at the time probably had it way out of adjustment! When i say worked ok for a day it really couldnt have been with the first issues tho.a furnace tech might know why the loud ignition tho?