Central heating not working

330d

I bought a house a couple of months ago and cannot get the central heating to work. It was working fine when I bought it and at the time i switched it off. So the heating system is;

- Worcester Bosch Greenstar 15Ri Regular Gas Boiler
- Siemens RWB9 Programmer
- EHE0200361 RF Programmable Room Thermostat

So firstly, the hot water works fine.

The steps I have done;

- On the programmer I have tried all the settings from AUTO to constantly ON. When on, the light for CH comes on
- On the room thermostat, I have set the temperature to 20 degrees. Again tried all the modes inc timer and manual.
- The valves on the radiators are all on. 

Any ideas what I am doing wrong?

Jeepers_Creepers

Hi 330d.

Thanks for the clear post with lots of the important info :-)

Ok, we can say that the boiler is working, 'cos it heats the hot cylinder. We can pretty much say the Siemens timer is working 'cos it manages to turn on the boiler and valve to heat up the hot water. And you say the CH light also comes on as it should. That's usually pretty conclusive.

Next in the control line is the wireless Prog Stat which appears to be a Center Brand logo'd item (with apologies for their spelling).

https://www.directheatingsupplies.co.uk/pdfs/Basic Wireless Thermostat Guide.pdf

This is in two parts - the actual controller which is battery-powered (you've checked that the 'low battery' symbol isn't on or flashing?) and the receiver. The receiver has, I think from the pictures, TWO lights? If so, one will likely be 'power' to show it's powered up, and the other will come on when the control unit has 'called for heat'; ie when the boiler is being told to come on.

So the next step is - check the batteries, and check the two units are connecting wirelessly. And check what the lights are doing.

Make sure the Siemens is CH-ON when checking the Center Brand items.

330d

Jeepers_Creepers said:

Hi 330d.

Thanks for the clear post with lots of the important info :-)

Ok, we can say that the boiler is working, 'cos it heats the hot cylinder. We can pretty much say the Siemens timer is working 'cos it manages to turn on the boiler and valve to heat up the hot water. And you say the CH light also comes on as it should. That's usually pretty conclusive.

Next in the control line is the wireless Prog Stat which appears to be a Center Brand logo'd item (with apologies for their spelling).

https://www.directheatingsupplies.co.uk/pdfs/Basic Wireless Thermostat Guide.pdf

This is in two parts - the actual controller which is battery-powered (you've checked that the 'low battery' symbol isn't on or flashing?) and the receiver. The receiver has, I think from the pictures, TWO lights? If so, one will likely be 'power' to show it's powered up, and the other will come on when the control unit has 'called for heat'; ie when the boiler is being told to come on.

So the next step is - check the batteries, and check the two units are connecting wirelessly. And check what the lights are doing.

Make sure the Siemens is CH-ON when checking the Center Brand items.

Thank you for the reply.

The actual controller seems to be working fine, it has no low battery symbol or any errors. When i switch the unit on, the the burner symbol comes on which should in turn fire the boiler.

On the reciever I will check the lights. But i 'think' its fine as when I switch the controller on i can hear a click from the receiver.

Jeepers_Creepers

Cool - can you confirm that the receiver is working ok - that light should, I understand, come on.

Also, that button on the receiver is - again I think - an override, so press that and it should turn on the boiler manually. Does it?

(have a read of the instructions).

TELLIT01

Could it be something as simple as the boiler central heating temperature dial have being turned right down by accident?  We have seperate controls for hot water and heating on our boiler.  Alternatively, faulty room thermostat not sensing actual room temperature.

Grenage

I'd check the motorised valve first, assuming you have one.  They often get stuck when the heating has been off for a while; sometimes a little nudge does the job.

330d

Jeepers_Creepers said:

Cool - can you confirm that the receiver is working ok - that light should, I understand, come on.

Also, that button on the receiver is - again I think - an override, so press that and it should turn on the boiler manually. Does it?

(have a read of the instructions).

I will check shortly and get back to you.

TELLIT01 said:

Could it be something as simple as the boiler central heating temperature dial have being turned right down by accident?  We have seperate controls for hot water and heating on our boiler.  Alternatively, faulty room thermostat not sensing actual room temperature.

The boiler only has one dial. In fact there are only 2 buttons, on/off and the temp dial.

Grenage said:

I'd check the motorised valve first, assuming you have one.  They often get stuck when the heating has been off for a while; sometimes a little nudge does the job.

Where would the valve be? 

theoretica

What is the light on the front of the boiler itself doing when the heating should be on?

330d

theoretica said:

What is the light on the front of the boiler itself doing when the heating should be on?

The light is on blue constant and starts to flash when there is hot water demand. 

lesalanos

330d said:

Jeepers_Creepers said:

Cool - can you confirm that the receiver is working ok - that light should, I understand, come on.

Also, that button on the receiver is - again I think - an override, so press that and it should turn on the boiler manually. Does it?

(have a read of the instructions).

I will check shortly and get back to you.

TELLIT01 said:

Could it be something as simple as the boiler central heating temperature dial have being turned right down by accident?  We have seperate controls for hot water and heating on our boiler.  Alternatively, faulty room thermostat not sensing actual room temperature.

The boiler only has one dial. In fact there are only 2 buttons, on/off and the temp dial.

Grenage said:

I'd check the motorised valve first, assuming you have one.  They often get stuck when the heating has been off for a while; sometimes a little nudge does the job.

Where would the valve be? 

I would agree that it its possibly the valve.  It effectively switches between hw and ch.  Cannot see one on your photo though, 

You are looking for something like this (hoping the link works).  

https://www.googleadservices.com/pagead/aclk?sa=L&ai=DChcSEwidmsS-m_jtAhUl7-0KHQ15DlwYABANGgJkZw&ae=2&ohost=www.google.com&cid=CAESQOD2sBfAN_kfE30GX8j-NcW3GKrzlXu-tdzRyKxcEGprQa4eBJ3b7EBYEqzIH8bTYWzCf1FpSL7i0Zubp2lC_vY&sig=AOD64_2XFIxLkLqQkvHv9qH2NzbpCJPdXA&ctype=5&q=&ved=2ahUKEwiRl7y-m_jtAhVZi1wKHfWPDIoQwg96BAgCECk&dct=1&adurl=

theoretica

330d said:

theoretica said:

What is the light on the front of the boiler itself doing when the heating should be on?

The light is on blue constant and starts to flash when there is hot water demand. 

According to this (does it look like the right manual?) a flashing light is the fault indicator.  Try the reset suggested and see if that does anything. 

https://www.heatingspareparts.com/content/docs/worcester_41-311-75_greenstar 12-24 ri mk2 operating instructions.pdf?v=170828113657588674