Furnace blower runs, but no heat

[Conquest1]

Hello,
my blower motor comes on but the heater never lights off.
Warm water heater works great.
Can't hear any igniter noises over the blower noise. Brand new batteries, fully charged. Took of the panel, can't see anything that looks like a switch, valve or anything.
Read some previous post about a similar problem, have not tried to run the stovetop to purge...
Thanks in advance for any thoughts...it is getting cold out there.
Have a 1995 Gulfstream Conquest on a Ford E-350.
Any recommended shop in the Austin, TX area?
Or, does someone know what type heater was used by Gulfstream back then, maybe I can find out some info that way...

[ksg5000]

Here's a link which may help -- go to the section which discusses causes/cure for blower works but furnace won't ignite.

RV Furnace Trouble Shooting - RV Furnace Trouble Shooting Page

[Dave from MN]

The first thing that happens is the fan starts running to make sure any flumes are cleared out. A sail switch tells the furnance module that the fan is running. So bad sail switch or module?

[rvten]

Does the fridge run on propane?
Think you need to purge the propane line. By running the stove top.
Is there a gas shut off by your furnace? Not a common thing, but check anyway.

[Steve N Sal]

Quote:

Originally Posted by Dave from MN The first thing that happens is the fan starts running to make sure any flumes are cleared out. A sail switch tells the furnance module that the fan is running. So bad sail switch or module?

x2

[LadyFitz...]

Is your furnace part of a basement A/C unit?

[bwd111]

Quote:

Originally Posted by Conquest1 Hello, my blower motor comes on but the heater never lights off. Warm water heater works great. Can't hear any igniter noises over the blower noise. Brand new batteries, fully charged. Took of the panel, can't see anything that looks like a switch, valve or anything. Read some previous post about a similar problem, have not tried to run the stovetop to purge... Thanks in advance for any thoughts...it is getting cold out there. Have a 1995 Gulfstream Conquest on a Ford E-350. Any recommended shop in the Austin, TX area? Or, does someone know what type heater was used by Gulfstream back then, maybe I can find out some info that way...

Either fan switch or limit switch is bad. Voltage must pass thru all saftys before lighting main gas valve