Author Topic: Air in heat register 232 F.  (Read 105 times)

Offline Fearless1

  • *
  • Posts: 76
  • Member since: 2015
  • I own: a Motor Home
  • Year: 1987
  • Make: Tiffin
  • Model: Allegro
  • Chassis: Chevy P-30
  • Engine: 454
Air in heat register 232 F.
« on: January 08, 2017, 12:18 PM »
The air inside the register from the furnace was reading 232 F. I'm thinking (it happens.....Sometimes) that might be a tad to hot? i??  Thoughts or suggestions? Also the fan will come on (before it's hot) and air will be cold for a couple minutes, sometimes it doesn't get warm at all. The fan runs long after the fire is out and blows cold air for a couple minutes. I often have to turn the thermostat off, wait a couple minutes and turn back on before can get heat or to cut off fan blowing cold air.  i?? i??
Fearless1 - Just like my 26# Texas Miniature Chihuahua, Bambi-aka-Miss Priss-Miss Pedro
"...choose you this day whom you will serve..." Joshua 24:15

Be Alert.....the world needs more lerts.

"To thine own self be true, and it must follow, as the night the day, thou canst not then be false to any man.”
William Shakespeare's “Hamlet.”

Offline Oz

  • *
  • Posts: 3120
  • "So let it be written; so let it be done!"
  • Member since: 2002
  • I own: a Motor Home
Re: Air in heat register 232 F.
« Reply #1 on: January 14, 2017, 10:48 PM »
Previously enjoyed our '74 - D24 Indian & '74 - D24 Indian Custom

Offline DRMousseau

  • *
  • Posts: 335
  • Member since: 2014
  • I own: a Motor Home
  • Year: 1987
  • Make: 34' Georgie Boy
  • Model: Cruise Air II
  • Chassis: John Deere
  • Engine: Ford 460
Re: Air in heat register 232 F.
« Reply #2 on: January 15, 2017, 01:25 AM »

mmmmm,.... normal operation will see the fan come on, with blowing cold air "warming" as the furnace ignites. AND,... as the room warms to temp, the flame will extinguish, while the blower continues to cool the system for a bit. So coming on and blowing cold for a few minutes is normal,.... not warming up, or staying on blowing cold air, is a problem. And I'd suspect your igniter may need cleaning or likely replacement. Manually shutting it down and turning on again, forces a safety lockout to reset. I'm betting it may, or may not reignite and operate as normal, causing you to again shut it down and restart if it still blows cold.

I was curious as to jus what the local temps ARE around my furnace. After jus measuring them with a digital IR temp reader, the nearest outlet within 2' or so of the furnace, measures near 200degrees max at the opening. Most of the furnace housing itself reads about 180 or so. I may consider an additional inlet opening into my furnace bunker, as I feel this is awful warm temp in this area, and store absolutely NOTHING in this space.

Your 232degree readings do indeed seem excessive IMO. Have you ensured clear and adequate return flow??? Is your return cycling nearby heated air into your system rather than cold return flow???
To The Crazy Old Crow Medicine Show
DR Mousseau - Proprietor
Elixirs and Mixers, Potions and Lotions, Herbs, Roots, and Oils
"If I don't have it,... you don't need it!"

Offline CapnDirk

  • *
  • Posts: 221
  • Member since: 2016
  • I own: a Motor Home
  • Year: 1988
  • Make: Itasca
  • Model: Suncruiser
  • Chassis: P30
  • Engine: 454
Re: Air in heat register 232 F.
« Reply #3 on: January 15, 2017, 11:06 AM »
Having just been down the road with mine i'm a little familiar with the furnace (Dave also did a nice write up on the functioning of furnaces). 

That said, There is a deliberated delay of a few seconds when the thermostat calls for heat to blow out the burn chamber. With my new electronics this is about 4 seconds, and you will of course have a cold breeze during that time.  Gas valves open and igniter starts the flame.  When thermostat shuts off there is about 2 minutes of fan work to cool the heat core.  Again you have increasingly cool air during that time.

I would check to see if there are any obstruction where the furnace brings in its room air (side of the case)  the fan is cooling the heat core with air and sending the hot air into the room.  lower airflow would allow the heat core to get hotter, and the over temp switch (inside the furnace) could kick out making a restart problematic until cool.

Other than that, an intermittent problem with the thermostat (about $15-20) or the control board (about $85-120)
"Anything given sufficient propulsion will fly!  Rule one!  Maintain propulsion"

"I say we nuke the site from orbit.  It's the only way to be sure"


FULL Membership!

Want to start enjoying all the benefits  Full Membership has to offer?

Become a Full

Want to enjoy your

Full Membership

without ever having

to renew?

Become a:


* Salvage Yards

RV Salvage Yards


* Resources

Need parts and information?
View the Resource List