how can i check my honeywell v4073a 3-way diverter valve?
24i fan keeps stopping poss bearing ?
H9 and L9 errors?
Converting to Y Plan system?
The light on the heating is fading in and out on my lp112 control panel?
boss therm not working ?
Honeywell ST7100 programmer goes blank when RUN selected?
digistat not working properly?
Tybox827reset?
tripping out?
how often do we change the3032 battery in a digistat +2rf?
Y Plan - Mid Position Valve 'fault'?
channel plus xl model h37 timer showing 14.76 and none of the buttons are w?
is there a way to just simply turn the temperature up?
dmestic hot water near boiling point, howto adjust temperature?
Fan running continuously?
Hot water but no central heating?
Remote timer bps242rf how does it work ??? ?