[Latitude 28]

Hello All,
Several weeks ago it turn cold and I fired up the Aqua Hot to give the coach some heat.  It heated up to temp with no issues....checked on it latter that evening and all was well.   The next morning there was a puddle of fuel under the AH exhaust pipe.  The unit was running but there was no fire in the burner can.

I replace the nozzle and adjusted the probes.....the unit looked like it had been service by the PO as the old nozzle and burner looked fresh.

Did a operational check other than the burning of the excess raw fuel which cause some smoking for the initial starting up all seemed in order.

So today I started up the AH and it heated up just fine.  Used the shower with no issues.  once the water temp cooled a bit the AH called for heat but the unit ran and with no burner ignition.  Fuel ran out of the exhaust pipe and puddled just like before. 

What would cause the ignition not to fire properly on the second call for heat?

Thanks
Steve