Baxi Combi 80 Eco

[skywalker181]

Hot Water/central heating fault. central heating constantly on even when switched to hot water only. also the analogue timer is not working. Boiler will stay on in all 3 positions. the boiler was working fine till last week it over heated twice and I manual reset it .then this fault accrued please help me! my house is cooking..

 

[gas_man_gaz]

is the neon indicating hw demand lit?

 

[mario500]

Sounds like the time switch has gone closed circuit. Is it a built in timer with the little pins all around it?

If it is you need to disconnect the link to establish the fault. If this proves to be the problem a new grasslin clock should be readily avalible at a merchant near you.


Al

 

[skywalker181]

yes amber neon light is on

 

[skywalker181]

would analogue timer going closed circuit also make the HW/CH control not work in ether postion CH/HW or HW only

 

[gas_man_gaz]

turn ya hw thermostat knob to 0 and see if the boiler turns off

 

[skywalker181]

turning HW control to 0 no difference boiler still fires for 2 sec shuts down and fires shuts down and so on turn CH control to 0 still the same

 

[mario500]

Ah - not timer fault then if you turn ch temp right down to lowest setting and boiler is already hot.

Something else is creating a demand - maybe micro switch on divertor gone to closed circuit? maybe divertor stuck in the dhw mode?


Al

 

[gas_man_gaz]

i think ya hw microswitch will be stuck on

have ya taken the cover off yet?

 

[baxpoti]

i think ya hw microswitch will be stuck on

have ya taken the cover off yet?

10/10

 

[skywalker181]

yes got cover off now what micro switch is stuck got service manual in front of me whats the switches name

 

[gas_man_gaz]

if ya look to the left hand side of the boiler ya will see a round brass valve with two small pipes going to it, the microswitch is attached to the front. with no taps running the pin shouldn't be pressing on the switch

 

[baxpoti]

Prt No. 248207 Cable - Selector Switch/Pump