Recent: Safely remove screen protector from a Macbook Air?

Mend > Home Heating Systems

Mend Ravenheat CSI 85AT Boiler Central Heating PCB

Ravenheat CSI 85AT Boiler. Central Heating not working?

After switching the setting on my Ravenheat CSI 85AT Boiler to Central Heating and Hot Water (its been set to just Hot Water through the summer and worked perfect in that setting) the Central Heating will not switch on, in either auto timer or manual mode. All the relevant led's on the timer panel are indicating that it is working, however the boiler is not! the hot water setting still works perfect!
I've checked the room thermostat and it's definitely sending a signal to the Main PCB asking for heat.
Does the main PCB need replacing or should I be checking other components first? I would be grateful for any help!

Allan
September 2008
i have the same boiler and same problem and it happens at the same time every year - the boiler is only 3 yrs old!! I seem to think it's because it hasn't been used over the summer and then it just won't kick in. Last year my plumber replaced the thermistor and it worked fine and charged £50. i have just bought a thermistor myself from ebay for £7 and replaced it and it's all looking good!! I bought a hot water and ch thermistor as they are both the same part and replaced the hw one first as it is easier as you just need to turn off your water and electricity supply. it worked but just for a day so i have just replaced the ch one and it has just all kicked in again!! How chuffed am i - had to do it all myself as my hubby is working away!! The ch thermistor requires the system draining so was much trickier but worth it as i am now toasty warm!! thanks Liane

liane
September 2008

Automatic Answer

We may have found other answers which could help you.

Click here for Boiler Central Heating PCB

Related Questions ...

Mend central heating fault reset
1

Central heating not working?

My glow worm micron 50FF works for a short time then shuts down and both lights go out. Neither of the two lig... [Read more]
Mend boiler central heating pcb
1

Fault on fan or flue?

Our recently installed Main Combi 30 He ECO boiler is displaying a 50 degree LED fault (Fault on fan or flue).... [Read more]
Mend central heating boiler water fine checked
1

worcester 28i rsf has no central heating?

my boiler has no central heating but hot water fine. have checked following:-pump unit, combustion fan,resista... [Read more]
Mend central heating pcb
2

How can I fix my Ariston central heating boiler CLAS/ HE38?

Have replaced PCB in the boiler and "error code 302" has appeared it is communication error. Could it be one... [Read more]
Mend boiler central heating temperature sensor
2

Potterton Suprima 80L?

The boiler works with no logout. The lights operate as per the manufacturers manual. After 60 seconds the boil... [Read more]
Mend boiler central heating pcb
1

Procombi 85 HE hot water ok, but central heating not working?

The boiler is working when I run hot water, it fires up when the central heating is turned on, the pump get's ... [Read more]
Mend boiler central heating thermostat
1

how can i fix my ideal classic boiler?

i have to switch my central heating off at the mains it wont switch off with the clock or the thermosat i have... [Read more]
Mend ravenheat pcb central heating
1

my ravenheat rsf 84 et boiler?

can someone help me my reavenheat rsf 84 et boiler when you turn on the hot water the boiler fires up ok then ... [Read more]
Mend central heating diverter valve PCB
2

Problem with Ideal ISAR HE24 ?

I have just fitted replacement PCB to my daughter's HE24 boiler as there was no LED display & no hot water or ... [Read more]
Mend boiler heating temperature
1

diverter valve not operating?

Hi I am having a problem with my potterton performa 28i boiler. Central heating works fine. Dhw giving cold ... [Read more]
Mend boiler pcb heating
1

control knob?

the central heating control knob has snapped off and tje other part is still on the boiler, I... [Read more]
Mend central heating Worcester Bosch heat exchanger
1

Worcester Bosch Highflow 400 BF boiler problem?

Hi, my boiler produces hot water on demand OK but refuses to turn off the central heating. Even with both heat... [Read more]
Mend locking out central fault pcb
1

Halstead Finest Combi Boiler Locking Out?

When a hot tap is turned on and the central heating is not on or on demand, the hot water flows whenever a dem... [Read more]
Mend central heating PCB programmer
1

Potterton Suprima 40?

Hi I have the above boiler 7 years old and the model with the faulty PCB I have changed two - last one upgrade... [Read more]
Mend Worcester PCB Combi
2

i have no central heating on my greenstar worcester 28i junior combi boiler?

i have no central heating on my boiler??? water works fine but no central heating???? fan & pcb have been rep... [Read more]

How to mend ...

Find out how to mend just about anything howtomendit.com for free repair help, information and advice.
Mend Home Heating Systems ...