Hi Brian, having read the forum, you appear to be the guru regarding these heaters. The problem with my D3L-251738 is that is continuously puts out white smoke. I've tried several things and have unsuccessfully found the root cause of the problem. Let me begin with saying that it is connected to a series 701-10 digital timer modulator. This was a replacement the original was missing when I bought the boat. I was told that this was compatible with the heater. No, I don't know if the problem existed with the old controller. This is a list of checks I've carried out; voltage 12.1V, removed the combustion air silencer to eliminate intake blockage, pump is at correct angle, used a clean supply of diesel from a small bottle to eliminate bad fuel, no blockage in the exhaust pipe. The heater appears to cycle through the correct start up sequence. Your valued knowledge to help resolve this issue would be much appreciated.
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