Question about Reddy Heater-170,000 BTU Kerosene Deluxe

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Flame light flashes after unit runs for awhile.

I have a 170T and it will run for awhile and shut itself off and the flame light flashes and after trying to reset the unit it will not reignite.

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Check for spark and clean your plug. If you have good spark it's one of two things, the high heat limit control or the flame sensor, my guess would be the flame sensor.

Posted on Jan 23, 2009

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Posted on Jan 02, 2017

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Reddy heater runs but not consintently shuts down and have to restart it. model 165DT


Shuts down in 5 seconds? If so, it is supposed to. If the flame is not perfect. Read on..

The ignitor (glowbar) only glows for 5-7 seconds- just long enough to create combustion. Once the flame starts- the flame must keep itself going. So if at anytime the flame goes out- it stays out- there is nothing to restart it.

What most people don't realize is that the photocell is looking for a flame with perfect color, which means the heater is not emitting pollutants. If the flame runs too rich or too lean (polluting) the photocell shuts the unit down. No self re-start.

Start troubleshooting by setting the pump pressure. Pump pressure is directly related to fuel delivery. Poor fuel delivery equal poor flame equals shutdown.

Troubleshooting tips

Oct 25, 2011 | Heating & Cooling

1 Answer

Runs for about 15 secs and then stops


Let's getdown to basics. You have already done the most basic, and time saving task- that being setting and monitoring the pump pressure. What youmust troubleshoot:
  • is the problem fuel related? or
  • is the problem electronics related?
To find outyou must eliminate all fuel related possibilities because there is not much wayto successfully troubleshoot the electronics without access to DESA'sdiagnostic tool- HA1170.Keep inmind that the ignitor only stays red for 5 seconds- just long enough to startthe flame- the flame must perpetuate itself. If at ANYTIME there is a momentaryflameout condition (or off-color flame condition) the heater will shut down.The photocell's job is to monitor the flame condition. If the photocell doesnot see a flame that it likes, then it will shut the heater down.If thisheater was in my shop and the customer described the problem, the first thingthat I would do would be
  1. check the pump pressure- this is ALWAYS the first step.
  2. shine a flash light into the fuel tank- inspect for water droplets in the tank
  3. check for possibilities if a restricted fuel filter
  4. check for possibilities if a restricted nozzle
  5. with soapy water check for air leaks from the pump - all the way to the nozzle.
  6. If all of these check out then remove the top cover. If the heater runs fine with the top removed- replace the nozzle. Desa recommended annual replacement.
  7. The motor has an internal heat sensor. If the temp on the motor exceeds the safe level the sensor will shut the unit down. There is usually a pattern. The heater will run for an extended time, shut down, re-start, but the runtime is short. Let the unit cool and the pattern repeats itself. Feel the motor after shutdown. It should only be warm to touch. If hot, remove motor and bench test.. 2 possible causes- broken or grungy rotor or internal problems in the motor.
Troubleshooting tipsIf theproblem persists, then replace the control board & photocell.

Oct 15, 2011 | All-Pro Kerosene Garage Shop Heaters - All...

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I have a 170t all pro heater when i start it the hot surface ignitor comes on the fan starts then it all stops and the flame light comes on


check out the presure switch could be blocked, or try jumping it ou to see if it lights , check flame sencor is clean

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I have a Bosch Aqua star 240 fx tank less water heater. The unit will ignite and run for 5 sec (Flame visible through window) the flame goes out and it reignites and runs for 5 more seconds and again goes...


It sounds to me like you tried about everything I would. So I think you're already thinking about what I would do next. Try the flame sensor,and as last resort check all connection . Remove wires one by one clean and reattach. If all else fails change cotrol board. It's very hard to fix when it's not consistent. Good luck. Thanks

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INtertherm natural gas furnace starts up 3 times then shuts down. LIght on box inside flashes 3 times.


I would bleed the lines of air if the unit hasn't run for more than a few weeks.

If the flame starts up, but shuts down, a thermocouple or electric eye is erroneously not reading the flame, and it is shutting down for safety reasons.

If you would provide the model number I will look up more specific technical information, if you desire.

Good luck on this.


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William forshaire 435 runs well for awhile until


Try cleaning your thermocouple,and resetting it where was, which is located at the pilot flame. this should solve your problem.

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