Hunderliggur said:
RTFM:
f) No fuel
No-fuel testing time during fuel firing start [Fd60] - after switching to the
WORK mode, if water temperature doesn't reach temperature set with the thermostat in programmed time, the control process will be turned off and the display will show the message: [FUEL].
Will try my skills at Polglish translation... When starting up, the variable "Fd" which has a default value of 60 minutes, will turn everything off and display the FUEL message if the boiler hasn't reached the thermostat specified setting by the end of that time. Once the temperature is reached, you go to work mode...
You can return to the previous mode by pressing the STOP button.
If this happens, it's the opposite of the Microsoft approach - press STOP to go back into START mode...
No-fuel testing time during work mode [Fb30] - in WORK mode, if temperature of water in the boiler decreases below temperature set with the thermostat, by hysteresis value, and don't reach temperature set with the thermostat in programmed time, the control process will be turned off and the display will show the message: [FUEL].
Once in work mode, if the temperature drops below the thermostat set temperature by more than the hysteresis value (i.e. it goes below the "turn off" value) it starts the timer for the Fb variable, which has a default of 30 minutes - if the temperature has not come back up by that time, it will shut down and display the FUEL message
The basic idea is that it gives you a certain amount of time, specified by Fd, to get up to temperature, or it thinks something is wrong, and shuts down... If it gets up to temperature, and then the temperature drops below a certain value, and doesn't come back up within an amount of time specified by Fb, it assumes that either you are out of fuel, or something is wrong, and shuts down... It actually makes a certain amount of sense, as there is no sense in continuing to try to get heat out of a fire that isn't doing right...
As my late mother would say, about as useful as tits on tomcat.
Polish to English leaves litte to be desired. Any suggestions?
No promises, but I hope this helps - probably I'd look at where the thermostat (and the Hysteresis value if that's adjustable) is set, and how the function of your other controls might be affecting the boiler temps, and see if you are pulling the boiler down to far for to long... If nothing else, increasing Fd and Fb (especially Fb) might help solve the problem.
Gooserider
I think even Stevie Wonder can see how it works now. LOL I have to read that manual at least 12 times before I think I understand what they are trying to say.