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Dunkirk flame sensor - Dunkirk PWB-4D Electronic Ignition, Gas Fired, Hot Water Boiler, NG, Taco Pum

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Why does my bosch 25e ingnite then blows out repeatedly and occasionally stays on if i turn tap on and off and on for abit.


Does the unit have a flame sensor? Check manual. Flame sensors get corroded and need cleaned or replaced. I have had success cleaning them but when you can buy a new flame sensor

Apr 25, 2014 | Bosch Water Heaters

1 Answer

Thermostat Pilot does not light


This unit should be electronic ignition. Multiple issues could be the cause. First check the flame sensor. If those is not the problem then probably a bad control board. Don't know specs on the resistance of the flame sensor. You could try cleaning it with an emery cloth or sandpaper. Do not touch flame sensor with fingers it will ruin it

Jan 05, 2014 | Rheem Paloma PTG-74PVN / RTG-74PVN...

1 Answer

Installed a year-and-a-half ago, problems so far: thermostat replaced on hot water tank within one month of installation, one pump replaced, leaking plug in the front of boiler with Dunkirk rep never


Its probably time for small claims court and a new company to install good equipment. Have a couple different companies/contractors give an estimate and possibly expert advice/witness you would then be able to use in court so you can get reimbursed from a bad company. Hope it all works out.

Apr 20, 2013 | Dunkirk Q90-75 Quantum High Efficiency...

1 Answer

Burner lights and shuts off 3 times and then give warning lights A and B


It depends on the model but AB on most of the AOS the A & B LED's lighting up usually means ignition/flame failure.

Ignition/flame failure:

The gas control valve/thermostat has reached the maximum number of retries (3) for ignition and is currently locked out for one hour. Cycle the power to the water heater off and on to reset.

Basic troubleshooting/solutions:

1 Ensure flame sensor is making good contact with the burner flame and ensure flame is steady. Also ensure supply and manifold gas pressures are within the requirements in the installation manual.

2 Gas supply is turned off - pressure is too low. For low gas pressure, consult with your gas utility.

3 Ensure the flame sensor is clean - use fine steel wool to clean the flame sensor.

4 Check igniter assembly plug and the socket on the bottom of the gas control valve/thermostat for good connection. Replace igniter assembly if the plug is worn or damaged. Replace the gas control valve/thermostat if socket is worn or damaged.

5 Replace igniter assembly.

If this does not apply to your model then here is a link to the instruction manuals for all models:

Residential Gas

Apr 14, 2013 | A.O. Smith Water Heaters

1 Answer

Sometimes it doesn't light at all other times during use the hot water goes off and the box keeps flashing green as it continues to spark


it sounds like the flame sensor is dirty or faulty. when the pilot lights the flame sensor rod recognises the flame to allow the main gas valve to open and ignite the burners. you can clean the flame sensor with some steel wool or sandcloth

Dec 29, 2010 | Bosch & Tankless LP Hot Water Heater

1 Answer

I have a 2 year old rheem power vent water heater model # 42vp50fw. It suddenly stopped working. It will try to ignite. The igniter will glow and the call for gas will ignite the burner. After a few...


Hi,

The flame sensor is bad....and it is not sensing that the flame has lit....

Some models have a separate flame sensor and some use the ignitor to sense the flame...

If it has a separate sensor then clean it with a soft cloth... if it is the ignitor then the ignitor is bad...

heatman101

Nov 25, 2010 | Rheem 50 Gallon FVR NATGAS Water Heater...

2 Answers

I have a Rheem Classic Series Super Quiet 80 gas furnace. My problem is the furnace will turn on burner fires for a couple of seconds then burner turns off and fan blows. This cycle cotinues and eventualy...


Sounds like it could be a dirty or bad flame sensor.
When the burner lights ,there is a flame sensor in the flame and it is suppose to sense the flame and send a signal back to the control board which will keep the gas valve open, if it gets dirty or is bad it doesn't send the signal back to the board and the board will shut the gas valve off and after three tries it will lock out the furnace and you have to reset it to get it to work again.
The flame sensor looks like a wire and it's in the flame usually it will get gas deposits on it, then it won't work.
You can clean this sensor with an extra fine piece of steel wool, but before you attempt to do this DISCONNECT ALL POWER TO THE FURNACE.

Dec 29, 2009 | Rheem Paloma PTG-74PVN / RTG-74PVN...

1 Answer

The pilot light will not stay light


The flame sensor is not sensing flame. If it is a thermocouple sensor, they can be purchased for 6 bucks and replaced in 15 min.

Some units have a different type of flame sensor and are a part of the ignitor assembly. In that case, the ignitor assembly would have to be replaced. Those usually run 20 to 60 bucks.

There is a remote possibility that the sensor and pilot flame shroud need to be cleaned, due to rust and other corrosion preventing the flame from properly contacting the sensor. You can try cleaning that first, but chances are you will simply have to replace the sensor.

Oct 11, 2009 | Water Heaters

1 Answer

The pilot light will not stay lit


The flame sensor needs to be replaced.

If it lights, but goes out as soon as you releasse the buttton, the flame sensor is bad.
You will also want to clean the pilot to make sure there is no rust or corrosion deflecting flame from the sensor.

Aug 30, 2009 | Water Heaters

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