I have a model R115 hot ignition kerosene heater. Originally the heater would ignite( good yellow flame) after 4 or 5 seconds it would shut down. According to the troubleshooting guide I replaced the ignition control assembly(circuit board) & photo cell, did'nt help at all. Since then I have replaced ignitor,set pump pressure @ 5.3, new fuel filter,new air & fuel lines, cleaned air filter,cleaned nozzle, checked for leaks at nozzle adaptor & pump housing. Nozzle sprays a good even pattern. Now heater will run indefinetly with top cover removed( would't run at all before except for the 4 or 5 seconds). I can now place the cover starting at the exhaust end & gently lower it to within about 2 inches at the pump end before the unit shuts down. I have watched the flame very close as I lower the cover & noticed it turns more blue than yellow. I have called & talked to two factory technicians neither one had any concrete suggestions for a remedy. I'm at witts end. Can you help before I junk this heater that looks like new? The heaters with sparkplugs were much more simplier & reliable. Oh yes new fresh kerosene too! Thanks, Larry

Heating & Cooling - All-Pro - Kerosene Garage Shop Heaters - All Pro PK115T Forced Air...