Will Berry Posted on Apr 18, 2011

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Have mod. 400 dv std. Heater will not get to set temp. but runs for 30 to 45 seconds before stop and re start.Have replaced flame prope and both limit switches and themostat.Also have replaced the controler ! Any ideals ???? Thanx Will B.

Will Berry Apr 20, 2011

Hello, ok replaced the flame sensor again,the control mod is new [ last month ] still same problem. That leaver only the transformer and the air switch that has not been replaced. Would one of these cause the symptoms I'm having? If not should the whole wiring harness be replaced? Thanx WEB
Will Berry Apr 22, 2011

Hello,both are new. For the second question,this unit has the DDTC board.

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Anonymous

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Posted on Apr 18, 2011

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If you have ignition and you know that the flame sensor is good, it is either a wiring problem or the ignition module.
Note: Ive installed brand new flame sensors that were defective. Took me days to figure it out since id just replaced it.

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Anonymous Apr 20, 2011

Is it the control module thats new, or the ignition module?
Anonymous Apr 20, 2011

Also I forgot to ask, is this model equiped with the DDTC board or the 6800 board?
Will Berry Apr 22, 2011

Hello, both are new . The anwser to your second question is this unit has the DDTC board.

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Have mod. 400 dv std. Heater will not get to set temp. but runs for 30 to 45 seconds before stop and re start.Have replaced flame prope and both limit switches and themostat.Also have replaced the controler ! Any ideals ???? Thanx Will B.

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Anonymous

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