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Fan runs, igniter runs, but heater won't light. fault light flashes 6 times quickly. chart says "cad cell shut down"? What does this mean? Or what do i need to do to make the heater run properly?

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I googled cad cell shut down.
Many answers. Most likely the flame detector is bad.

Posted on Apr 13, 2015

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1 Answer

What is a cad cell and what does it do


A cad cell is a photo-electric device that reads the UV rays given off by flame after it has ignited. If it does not 'see' the flame, due to a flame failure OR a cad cell failure, the control circuit is locked out.
Make sure there is no carbon on the front (window)of the cell and make sure its adjustment is in perfect alignment to the flame.

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I have a halstead finest gold combi when I turn the boiler on the boiler goes into its ignition sequence when it comes to ignite the boiler fires but after the igniter stops the boiler cuts out completely...


Difficult to get too specific without knowing if you have gas or oil. Also, I am going under the assumption you mean the burner shuts down, not the whole heating system. That being said, all heating appliances have whats called a safety curcuit. Each control has the ability to shut down if certain critera are not met. There is a sensor that senses light down the blast tube. If no light is sensed in a predetermined time period, then the sensor cuts power to the burner. This stops delivery of fuel so if it does ignite you wont blow up.
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It may be the sensor (cad cell eye) is doing its job, however why is the question. Could be a number of things including the fuel delivery, ignition, improper air adjustment, etc.
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We have a model TS210KT kerosene heater and it runs for 15 sec. and then E1 CAD Cell Shutdown code comes up and the heater shuts down


  1. 1) Check wiring to Cad Cell (per wiring schematic in manual). Test heater.
  2. 2) Clean Cad Cell photo cell.
    a) Slide Cad Cell out of Cad Cell holder.
    b) Push the photo cell out of the white rubber Cad Cell housing by

    pushing on the blue and white wires.
    c) Clean the photo cell with a soft cloth and rubbing alcohol.
    d) Pull the photo cell back into the Cad Cell housing and reinstall into

    holder.
    e) Test heater.

  3. 3) If the heater still does not operate, replace Cad Cell. Test heater.
  4. 4) Replace oil flame control assembly. Test heater.


    Owners Manual with full details here.

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Attached to the water heater is a troubleshooting chart for your sequence light. 1 flash means..., 2 flashes means...., and so forth. Find the chart, count the flashes and see what it means and we'll go from there. Douglas

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I have a Goodman high-eff furnace, 115 BTU/hr. The fan runs constantly but it has stopped blowing warm air. I'm getting 6 flashing lights as error code. What's this mean?


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There appears to be a short in the unit. Not sure where. The power to the fan is not interrupted completly when the fan shuts down, still feeding voltage to the fan, keeping it running slow. Before checking the wiring, please turn off power first.

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most parts for kero heaters are interchangable. go to desatech dot com for parts. check for a reset button for your heater. if no reset, does the fan run? your unit can use one of two ignition parts. a spark generator with a spark plug or a hot surface igniter. the unit uses a cad cell flame detector. you might need to replace this.

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