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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Slant fin boiler galaxy natural gas, pump starts and runs. Igniter comes on . Pilot lights. Burner lights. Runs for seconds. Burn shuts down. Igniter starts pilot light, pilot goes out and on and on


The flame sensor, which is located in front of one of the burner flames is probably oxidized and needs cleaning or replacement. If the unit can't "sense" the flame, it will continue to cycle.

Jan 22, 2017 | Slant Fin Heating & Cooling

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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.

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1 Answer

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.


Nov 06, 2010 | Intertherm Heating & Cooling

1 Answer

170T RUNS 10 SEC SHUTS OFF. NEW FILTERS HAVE BEEN INSTALLED


check the electric eye. sounds like it can't see the flame.

Jan 11, 2010 | Reddy Heater-170,000 BTU Kerosene Deluxe

1 Answer

My 170T heater comes on for about 30 seconds then suts off


Just buy the repair kit that has everything a(flters ,air/fuel--sparkplug --vanes in the pump assembly ect. ect..

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The unit should have a fuel & air filter. Check that both are clear. Inside the burner tube, there will be a photo-cell, if the lense is dirty it will shut the flame off. The photo-cell needs to see the flame. You can carefully and gently, clean the lens with a tissue, soft cloth, or Q-tip. Please let me know how its coming along.

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1 Answer

Flashing amber lights


it means that the flame sensor is not sensing a flame. If the flame is present and nice and blue the flame sensor is probaly dirty. Remove the flame sensor and lighty sand it with sandpaper.

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