Eberspacher BN2 gas heater
VW bug, beetle
The BN2 can be difficult to light, that is because it only
has a glow plug and does not have spark ignition like the BN4.
- The heater needs lots of current during start up. Make
sure you have heavy gauge wire supplying power to the heater,
check that all connections are good. During testing, a car
battery is best, or a heavy duty battery charger.
- It helps to prime the fuel pump and have fuel flowing
out of the end of the hose before you try and start the heater for
the first time. The pump is a solenoid plunger type that meters the fuel
with each "click". I manually apply power and "click" the
pump to prime.
- If you turn the heater on and it does not start after a
couple of minutes it automatically shuts down. Wait a couple of minutes
reset the red switch.
- To check if the glow plug is working, just touch
it during start up. It should be warm - hot.
- You will need to set the mixture for your altitude and
conditions. Loosen the 17mm nut on the pump and turn the outlet in or
Out is richer, in is leaner. If the heater starts slowly and does not
produce much heat, it is too lean. Black smoke means it's too
If the heater will not start:
Assuming the heater is not broken in any way there are two likely reasons.
No fuel, or the heater is flooded. If you have fuel coming out of the
end of the hose at the heater, then it is probably flooded. Unplug the
fuel pump and try and start.