Put a check valve in after the pump. Pumps like to pump their not good at suction. In the cold the fuel in the tank will contract and could suck the fuel from the line. My parking heater would not fire up this morning, and I believe that to be the cause 24 degrees. It fired up no problem at 27 degrees this week. I have fresh northern fuel so jelling should not be a problem. Could my hose clamps have not been tight enough and let air in maybe. It's running now, if I could just locate my manual so I knew what the red flash count means.
15.1. Fault code output
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After a fault has occurred in heaters with a control element, the fault code is output by the switch-on indicator/fault code indicator lamp flashing. After 5 fast flash pulses, the fault code is output by a sequence of long flash pulses, corresponding to the numbers in the table below.
After a fault has occurred in heaters equipped with the combination timer, the fault code is shown in the timer display. The fault number is indicated by the indicator lamp flashing if the control element is used:
F00 Control unit fault / incorrect data set / K-bus faulty
F01 No start (no flame formation)
F02 Flame failure (repeated > 3)
F03 Undervoltage or overvoltage
F04 Premature flame recognition
F05 Flame monitor (petrol heater) interrupted or short-circuited
F06 Temperature sensor interrupted or short-circuited
F07 Fuel pump interrupted or short-circuited
F08 Fan motor interrupted or short-circuited or overloaded
or blocked
F09 Glow plug interrupted or short-circuited
F10 Overheating
F11 Overheating sensor interrupted or short-circuited
F12 Heater lock-out
F14 Overheating sensor incorrect position
F15 Setpoint sensor interrupted