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Tim Cooke
Tim Cooke,
Category: Appliance
Satisfied Customers: 1026
Experience:  Owner at Self-employed
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My green star cdi boiler heats water but when I ask for

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My green star cdi boiler heats water but when I ask for heating it does not work . The unit has a boss therm controller bps242rf when turned for heating the lights show it is on i.e. Green light then amber / orange lights come on but no heat.
JA: How old is your boiler? What water pressure does the gauge show?
Customer: Seven years old pressure is 1 psi
JA: How long has this been going on with your boiler? What have you tried so far?
Customer: I have only tried it at the week end.
JA: Anything else we should know to help you best?
Customer: I have checked how to reset the controller and changed the batteries on it.

Good morning, welcome to the Technical section in JustAnswer. My name is ***** ***** I will help you today.

I will just review your question and reply with detail and, probably, some questions for you.

If you receive a phone call offer, please ignore it - these are system generated and outside my control. My understanding is that you won't be charged if there's no phone call.

So that I can give you accurate guidance, I will need to know the exact model of the model - this is shown on a rating label, somewhere on the casing or, if you have a flap, behind that.

On your Boss receiver, do you see it react to an increase in temperature at the room thermostat? Does it click? If so, does the boiler react at all? If so, could you describe what you see and hear? Is there any status and/or fault indication on the boiler display?

Customer: replied 3 days ago.
When I call for heat the control sensor has green light and orange light these both come on.I have had the system on test so I know the transfer pump is ok

Is this your boiler, or a customer's?

Customer: replied 3 days ago.
My boiler

Please take me through the test you did to prove that the transfer pump is ok.

Customer: replied 3 days ago.
I pressed the button that shows man with ladder on the boiler, rads stayed on for 15 minutes

Are you still looking for the model number?

Customer: replied 3 days ago.
Worcester Green star 30cdi
Customer: replied 3 days ago.
Green star 30cdi fan-gnome ng. When I move control to run it does not click

Where is the control that you're moving to run?

And what is "fan-gnome"?

Customer: replied 3 days ago.
I have taken the control from down stairs,you can use it anywhere in the house.
Boiler number is ***** star 30cdi fan-GB NG Combi 528.

OK. Please tell me the make and model of the control that you're using.

Customer: replied 3 days ago.
Boss therm BPS242RF
I renewed the batteries on

My apologies - you did give the model of that at the very beginning.

Bear with me for a few minutes.

The fault appears to be in either the Boss receiver (the BR1), or the boiler.

By experience, it's usually the receiver that's fault, but you need a multimeter (or equivalent) to determine which it is.

Customer: replied 3 days ago.
Thanks for your help

There is another way...

Customer: replied 3 days ago.
What the other way?

I'm just typing out the steps for you...

1. Power off the system;
2. Unmount the BR1 receiver from its backplate;
3. Disconnect the wire from terminal L1 and connect it to the LX terminal.
4. Power on the system and see if the boiler responds to the heating demand.

Customer: replied 3 days ago.
Do I connect L1 and Lx together?

Yes that's right.

Customer: replied 3 days ago.
Connection done heating on.
Boiler has warning code on.
So does that
Mean it requires new controller?

Um, are you going to tell me the warning code?

Customer: replied 3 days ago.
Not sure what they read
Display not in instruction manual.
They are two separate lines with a sideways line half way down

That's fine - the boiler will do that for up to 15 minutes, with minimum heating output.

When it has done that, does it respond to the heating demand created by bypassing the receiver, i.e. do you get heat at the radiators?

Customer: replied 3 days ago.
receiver off heating on

I don't understand "receiver off", but if the heating is now working then it shows that the boiler isn't faulty, so I would say that the receiver is faulty and needs to be replaced.

You don't have to buy the same brand and model again - you can choose anything you like. You're going to have to buy a set that includes the wireless thermostat anyway.

Customer: replied 3 days ago.
Thanks again. I have ordered a new controller anyway.

You're welcome :-)

Do you have any other questions? Are you happy with reinstating the receiver connections (with the power off) when you're ready?

Customer: replied 3 days ago.
I am doing that now.

Excellent :-)

Tim Cooke and other Appliance Specialists are ready to help you

Thank you for your kind bonus :-)