Vaillant Combi sine 18T

Aljay · 22 Nov 2004

Have a prob. Cental heating comes on when external timer is off, timer checked and is OK. Central heating can only be switched on or off by switch on boiler. Have replaced both circuit boards and micro switches on water section in boiler with spares all to no avail , help!

namsag · 22 Nov 2004

Could be flow valve on left hand side of boiler silver approx 12 inches long is faulty couple of micro switches on top could be stuck in heating position. also if boiler is set for preheat and valve is stuck mid way between heating and hot water this will allow rads to heat. At least 9 out of ten faults on the old valiant sine range where mechanical as opposed to electrical very reliable boards on these boilers

Aljay · 24 Nov 2004

Cheers for the info. Try that tomorrow.

Aljay · 23 Jan 2005

namsag said:
Could be flow valve on left hand side of boiler silver approx 12 inches long is faulty couple of micro switches on top could be stuck in heating position. also if boiler is set for preheat and valve is stuck mid way between heating and hot water this will allow rads to heat. At least 9 out of ten faults on the old valiant sine range where mechanical as opposed to electrical very reliable boards on these boilers

Found problem was sticking pin on water section stuck in the up position, pushed it up and down a few times and sprayed a bit of grease on it. All seems Ok now but will strip it down when the weather is a bit warmer and I can turn the boiler off. By the way do I need to drain the central heating system to remove the water section?

BDL · 23 Jan 2005

You have replaced 2 circuit boards and microswitches on water section to find the fault was a stuck spindle????????
Another person willing to spend a fortune on guesswork.
tut tut.

DP · 23 Jan 2005

BDL you should have added 'but unwilling to call a pro to repair the boiler'. Bound to have cost less than unecessary part changes

DP · 23 Jan 2005

Aljay are you a heating engineer or just tinkering with boilers. Have seen your post on Baxi 108e (should read 105E)

PEDANTICVINDICTIVEMAN · 23 Jan 2005

Doesn't seem a very good sign I mean sine to me he he.

kevplumb · 23 Jan 2005

like it ped

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Vaillant Combi sine 18T

namsag

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