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Heater Problem Why does it only stay on with the shell cracked open?

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Re: Heater Problem

The fan might be hitting the shroud - cracking it open the shroud frees up the fan.

Posted on Nov 26, 2007

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Runs when started but won't stay running.

REAL FACT is: If all individual components of the heater are at 100% but the air pump pressure is not on it's mark, then the heater WILL NOT continue to run!
Air Pump Pressure is directly related to fuel delivery. Read that statement again! It is the most important line of text on this website.
If the pump pressure is incorrect, then, the fuel delivery will be incorrect. As a result, the heater will not run to specs.
Instructions for setting the air pump pressure:
Air pump pressure is the pulse of the heater. Pump pressures range from 3 psi to 6 psi depending on heater BTU size (see chart below). A loss of ONLY 1 psi translates to a 30% to 17% loss of FUEL FLOW (starvation). You must know the specified required pressure and set the pressure accordingly.
Heaters with Hot Surface Ignitor technology are extremely critical to pump pressure. If the pressure is off by 1/2 psi, the heater may run for 5 seconds, then shut down because of IGNITION FAILURE. The only way to correct this problem is to set the pump pressure to DESA's recommended pressure specification.
  1. The FIRST STEP in diagnosing any heater problem should be checking the output of the air pump. Determine the air pressure required for the heater model that is being tuned. The air pump, in turn, is responsible for fuel delivery.
  2. If you do not know the required pressure look for a decal on the side (usually) of your heater. This decal will state the model number, serial number, fuel capacity, pump pressure, etc.
  3. If your plastic end cover looks like this......
m29609t.jpgM29609 has 2 threaded holes. The hole on the left has a square plug inserted. Remove the plug. Screw in the nipple end of the gauge into the threaded hole. Check for air leaks with soapy water.
If your plastic end cover looks like this......
m16545t.jpgM16545 has 2 threaded holes. The shorter projection with a hole on the left has a square plug inserted. Remove the plug. Screw in the nipple end of the gauge into the threaded hole. Check for air leaks with soapy water.
4. The other hole (longer projection) has a screw with a hole which adjusts a ball and spring relief valve assembly. Carefully adjust the screw until the gauge is reading the pressure level that is specified on the heater's label. If operating properly, the pump should produce more pressure than is required to operate the heater. The relief valve allows the excess air to escape before being sent to the nozzle.
5. Replace plug. Test for leak.
6. If you are unable to reach the desired pressure spray soapy water around the seal of the end cover- at the same time check the plastic cover for a crack. A cracked end cover will not allow the heater to perform properly and will not allow for an accurate reading. The pump must be set at the specified pressure in order to have adequate fuel delivery an adequate fuel atomization. Replace if needed.
7. If you set the pressure to specs and the heater does not perform properly or the cone does not glow a soft red, then check for other fuel delivery problems such as a clogged fuel filter, cracked rubber hose, clogged or worn nozzle, or a cracked nozzle adapter. Soapy water lightly sprayed in these areas will quickly identify the problem most of the time. Any air leak will create problems.

Feb 13, 2014 | Reddy HEATER R70DT 70,000-BTU PORTABLE...

1 Answer

Heat exchanger

If the fan coming on blows out the pilot light it is a pretty good indication that the heat exchanger is cracked. You should not continue to use the heater. I recommend contacting a qualified service technician to check it out and confirm that it is a cracked heat exchanger. Hope this helps

Dec 12, 2013 | Williams Heaters

1 Answer

Have a space heater in the living room and one in the kitchen. Seem to work fine during the day but go out at night. What could be causing that?

These unit have a Pilot/ODS system built into them.
The ODS (Oxygen Depletion System) will shut these units of if the oxygen get to low.
This will sometimes happen more at night that during the day...people moving around more during the day, opening a door let more oxygen in.

Try cracking a window and see if the units stay on all night as a test to see if this could be the problem.

Oct 25, 2010 | Desa International Unvented Gas Space...

1 Answer

Will a crack in the shell make the heater leak??

If the metal has cracked, it is only a matter of thime before it starts to leak. I wouldn't use it unless you are home. If it does leak, it can cause the heater to overheat and be a potential fire hazard

Jan 28, 2010 | DeLonghi 6707E Oil Filled Radiator Heater

1 Answer

My older Cozy cf353c counterflow wall heater gas shuts off pilot after it has run a while. I replaced the bad fan switch thermostat[ fan would not run untill changed] but not the other lemit switch . Could...

first have the heat exchanger inspected for a hole or crack, if there is an oval to round adpt. on top of unit or an elbow in vent this can cause the heat exchanger to split open and also cause what you are talking about.

Jan 14, 2010 | Cozy (W352E) Heater

1 Answer

Pilot light will stay on until the burner shuts off. Seems to blow out the pilot each time the burner shuts off.

Need to check the vent tube for restrictions
and check to see if the blower motor air is not blowing out the pilot if it is the blower motor air blowing out the pilot nthe the heat exchanger may be cracked and could be dangers

Dec 01, 2009 | Vanguard International Blue Flame - Medium...

1 Answer

Reddy heater shuts off when shell is put on

check out the fuses getting blown out on the internal chip circuit board and also the overheating component on that same circuit boasd.the burnt component will look little bit extra blackish on its sides.

Mar 03, 2009 | Reddy HEATER R115 115,000-BTU PORTABLE...

1 Answer

Heater wont stay lit unless cover is off. heater is dynaglo 12500

it souds like it is starveing for air, I would check all of the filters and the air line that runs to the combustion nozzle as it may have a crack or break in it. The nozzle does tend to get pretty hot and the lines get brittle after a while.

Jan 24, 2009 | All-Pro All Pro SPC K125 Forced Air...

1 Answer


There are any number possibilities for intermittent running.
1. Bad ground connection at the Ignition Device (transformer, spark box)
2. restricted fuel filter causing fuel starvation
3. crack in the plastic end cover
4. crack in the airline
5. crack in the fuel line
6. crack in the nozzle adapter
7. water in the fuel
8. Others I’m sure I left out

You must be the one to troubleshoot & find the cause.

Follow these troubleshooting tips

Dec 21, 2008 | Reddy Heaters

1 Answer


Exhaust is restricted or crack in heat exchanger. Get someone to look at it!

Feb 13, 2008 | Dayton (4LX41) Heater

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