main eco

[buckley plumb]

been to a main eco today about 3 years old. heating is fine but on hw boiler would not modulate seemed to heat water and turn burner on and off - fitted hw thermistor as hw thermistor fault come up occsionaly. this seemed to help and when the hot tap was turned on full the boiler would modulate - turn tap to half flow burner would hunt up and down trying to modulate down after 2 min it would modulate to low and be ok .I am thinking now heating thermistor as this controls the primary flow

 

[Leo21]

Do a resistance check on it, it'll be in the book. Also put it in to chimney sweep, and see if it runs ok on low. Had a faulty gas valve on one of these.

 

[buckley plumb]

Do a resistance check on it, it'll be in the book. Also put it in to chimney sweep, and see if it runs ok on low. Had a faulty gas valve on one of these.

resistance was ok mate but didn't check at different temps .run ok on low rate on htg

 

[Leo21]

Hex?....

 

[buckley plumb]

was thinking that but made no attempt to modulate at first . and after 2 mins ran ok until tap turned off and on again to do same cycle

 

[Leo21]

Id chuck another ntc on it, parhaps try running it out of its pocket so it can't sense and see if it still modulates.

 

[buckley plumb]

will order one tomorrow the one on main heat ex is £40.

 

[Leo21]

will order one tomorrow the one on main heat ex is £40.

Ouch, for an ntc? If it's a dry pocket, remove from pocket .Plug it in so it can't sense temps and see what happens.

 

[buckley plumb]

Ouch, for an ntc? If it's a dry pocket, remove from pocket .Plug it in so it can't sense temps and see what happens.

wet pocket mate

 

[cdodds2004]

I just plug a ntc loose to test see if it makes any difference to the way it fires. before changing wet pocket. but sounds like hex?