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I just replaced the heat exchange unit. It ran ok for a while then after it got up to temperature and shut down it wouldn't turn on again by itself. Fumes. I took off the cover for the burner and could see soot on all over. Flame burns yellow.

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Be careful opening combustion chamber with fumes present. The soot means the gas, or fuel to air mixture is incorrect. The inlet of the burner should have an adjustment that slides. That is an air coke . It may be closed or completly open. Adjust it to a blue flame. Close the combustion chamber when lighting.. If fumes build up, Ther is an explosion hazard when working on heaters. Any type . good luck

Posted on Jun 01, 2009

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Not heating, no fault codes, everything seems normal. Checked heat exchanger ok, flow switches ok, thermal reset ok just no power to the ceramic heating elements please help me ;-(


ELECTRIC Dryer no heat or little heat, or shuts down to fast:

Check your venting and lint basket. Check blower for lint build up and blower wheel obstruction., test by trying to turn the wheel manually by hand (should be easy) May have to remove cabinet or front/back plate to get to it)

Next check the heating element itself with a meter for continuity OHMS CLOSED CIRCUIT. If not its defective or has a short if its grounding out? Which in turns causes blown fuses or thermostats or
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The heating elements are located inside the heater ducts. If you think a heating element is faulty, test it with avolt-ohm-multimeter (VOM)set to the RX1 scale. Disconnect the leads from the power terminals and clip one probe of the VOM to each terminal. The meter should read about 12 ohms. If the reading is higher ohms, the heater is faulty and should be replaced. Replace a faulty heater with a new one of the same type and electrical rating. A heater connected to a 115-volt line usually has an 8.4-ohm resistance; a heater connected to a 220-volt line usually has 11 ohms resistance.


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Check the thermal cut off, the cycling and the hi limit thermostats.
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In some dryer's the control panel relies on a thermistor rather than a CYCLING thermostat to regulate the drum's air temperature by monitoring the component's resistance changes; resistance goes down as temperature increases and up when temperature decreases. Once the drum's air temperature reaches a certain level required to dry clothes, the control panel shuts off the heater. The panel will turn the heater on again and begin another heating cycle when the thermistor indicates that more heat is needed to keep the air temperature constant inside the drum

Lastly check your moister sensor. ( located inside the dryer door usually) Especially if machine seems to shut down early and clothes are still wet.
Test with a meter at room temperature and it should show continuity.
A failed moisture sensor will affect the dryer run time in the automatic moisture sensing cycle but it will not affect the heating of the dryer or the timed cycle. Which are reflected by the thermostats.

Read more :http://www.ehow.com/info_12203962_check-dryer-thermistor.htmlGOD IS So GOOD !!!!

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1 Answer

Sime ecomfort plus 30 HE keeps cutting out and shows a flashing green light. Sometimes it will run ok for a couple of hours before cutting out.


I had the identical problem with the same model. Technician eventually diagnosed faulty fan; the fan cools the heat exchanger. When fan fails, exchanger overheats and boiler automatically shuts down. It is possible to restart the boiler when it cools down but when the heat rises again - off it goes! Only answer is to replace the fan. My technician did the same as yours - on first visit he got the boiler running and left. Half hour later, boiler shut down. I read the installation manual and operating instructions and when he called again I pointed him in direction of fan, which had failed completely. These guys!

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1 Answer

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