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Discuss A21 fault on Greenstar Comfort RF in the Plumbing Forum | Plumbing Advice area at PlumbersForums.net

Paul Rogers

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Hi
I have a permanent A21 fault on my Greenstar Comfort RF receiver on my boiler. I am unable to access the settings as it does not respond to any input from the buttons on the panel. My thermostat is showing an A28 fault. My thermostat was not working so I disconnected it from the receiver in the hope of connecting them again, however the faults appeared. I have tried lots of videos and instruction manual, no joy. I am unable to access the installation settings as described in the manual. Any suggestions? Many thanks in advance.

WhatsApp Image 2019-06-11 at 21.20.19 (1).jpeg

WhatsApp Image 2019-06-11 at 21.20.19.jpeg
 

CBW1982

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GSR
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Hi Paul,

Looking in the instructions: A21 is no rf signal and a28 is unit is not paired. Have you tried new batteries - good ones not cheap zinc ones? Have you tried the un-pair and re-pair methods described in the instructions?
 
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Paul Rogers

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Hi, thanks for the reply. Yes I have tried them, no joy. The manual talks about being able to access my installer settings, I can't. Currently the boiler is not responding to any of the buttons at all.
Paul
 
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Paul Rogers

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correction i have just managed to turn the heat on manually but it still displays the fault
 

CBW1982

Plumber
GSR
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Hi Paul,

I’m not entirely sure then,maybe the receiver needs resetting, maybe contact Worcester Bosch?
 

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