heating system diagnosis

[nogga]

i have installed the following system oil firedwarmflow rd3 boiler celsia pump,switchmaster805, 2 motorised valves,hot water cylinder with stat.The boiler is about 5 years old but the rest of the installation could be up to 20 years. no room stats. Recently experiencing problems trying to switch off boiler by using the buttons on the switchmaster although the motorised valves on hot water and heating respond to the timer part of the switchmaster, however the pump continues to run 24/7.When the timer and the switches are put in the off mode any adjustment to the boiler thermostat will instantly fire up the boiler .Any ideas?

 

[LUNAT]

HI


it sounds like the pump is on permanent live.

 

[mickyg]

if the pump is continuing to run without the boiler it could be a pump over run on the boiler failing, however I don't know about this boiler.

 

[nogga]

HI


it sounds like the pump is on permanent live.

thanks for that i will get that checked. IN the meantime why should the boiler still fire up when every thing is switched off? any idea

 

[nogga]

if the pump is continuing to run without the boiler it could be a pump over run on the boiler failing, however I don't know about this boiler.

thanks will get the pump checked out have also asked a returnee why the boiler should still fire up when everything is switched off

 

[mickyg]

ok maybe i misunderstood your original post.
When you turn off from your programmer you say the pump continues to run 24/7, does the boiler also continue to fire or just the pump?

When you are experiencing the problem, check the motorised valves to see if they are open, search FAQ on motorised valves, plenty of info on this site.

 

[nogga]

ok maybe i misunderstood your original post.
When you turn off from your programmer you say the pump continues to run 24/7, does the boiler also continue to fire or just the pump?

When you are experiencing the problem, check the motorised valves to see if they are open, search FAQ on motorised valves, plenty of info on this site.

thanks for getting back, when the programmer is in the off position for both heating and hot water the pump continues to run,the motorised valves are closed but when the temp in the boiler falls the boiler will fire up although the valves remain closed .The boiler stat is at present on the bottom stop ie on the lowest temp available

 

[seco services]

if you have two mot valves sounds like one is jammed inside, microswitch etc, and giving a perm live to boiler/pump.

find the wiring centre and check the orange wires to locate what one is giving a perm live.

 

[nogga]

if you have two mot valves sounds like one is jammed inside, microswitch etc, and giving a perm live to boiler/pump.

find the wiring centre and check the orange wires to locate what one is giving a perm live.

Thanks for that .Will get my man with his tester to check that out Regards Nogga