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Type: Posts; User: planteric

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    Hi all, Apologies for the late reply, and many...

    Hi all,

    Apologies for the late reply, and many thanks for your advice.

    After a mere 6 weeks my plumber turned up to remove the opentherm and set the boiler control to NONE. Now all is working...
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    842

    Viessmann / Honeywell OpenTherm issue

    I have had the dreaded Viessmann Vitodens 100 / Honeywell R8810 OT bridge combination. Sometimes the boiler grinds to a halt with the F:A9 error and we have to power the boiler off and wait. It...
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