Stand-up heating again

Hello dear V8 driver,

I've got a problem again, my heater doesn't want any more. She always ran perfectly, but unfortunately I never used her in the summer and now she doesn't want any more.
Here's what happens.
Pressure on the flame button, standing heater starts to run, but no "tock, tock" noise from the rear of the gasoline pump. After exactly 60 sec, it shuts down and stays off (emergency shut down, since the flame button has to be pressed 2x to turn on again).
according to the fault plan of the stand heating it can be when it is in the first 60 sec. Shut down, just be one fuse or the glow candle, however all 3 fuses are in order and the glow candle I have already changed.
when does this "tock, tock" sound come, so when is petrol pumped into the stand heater, only after the first 60 sec? (Can't remember how it's been the last few years)
because I think that it might be on the gasoline pump and that after the long non-use is somehow firm.
the stand-up heating does not run either with or without motor start, so the second battery can be excluded.
when the engine is still warm, it also blows the residual heat into the car and switches on the air conditioning unit, but it does not heat up by itself and does not ignite.

Thanks for your help
MfG
Timm