Glow worm Micron 50FF working intermittently

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Glow worm Micron 50FF working intermittently

Postby monkeybrains » Tue Apr 10, 2018 11:39 am

I've had no problems until recently when the other day the boiler stopped working and whatever I change to try and get it working again on the UP1 / LP112 controller, boiler thermostat and room thermostat, nothing works but then after a few hours, I can switch it back on at the controller and it works again for around 15 minutes.

All thermostat settings are set high so it's nothing to do with being too hot.
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Glow worm Micron 50FF working intermittently

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Re: Glow worm Micron 50FF working intermittently

Postby kfordgas » Tue Apr 10, 2018 12:52 pm

Hello and a warm welcome to the forum
The thermistor is a common failing on this model, the boiler thinks it is hot when it is not.
Thanks
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Re: Glow worm Micron 50FF working intermittently

Postby monkeybrains » Tue Apr 10, 2018 1:57 pm

Okay, thank you very much for your reply.

I'll get one of those ordered.

Thank you again :)
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Re: Glow worm Micron 50FF working intermittently

Postby monkeybrains » Thu Apr 12, 2018 12:00 pm

The replacement thermistor has not fixed the issue.

It seems there is power to the controller but no power going to the boiler.

I did replace the controller with a new one but this didn't fix it either.
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Re: Glow worm Micron 50FF working intermittently

Postby kfordgas » Tue Apr 17, 2018 12:19 pm

You need to start from the top. Clock - thermostats - zone valve - boiler. Chase where the power is failing when it doesn't come on. This is the process I assumed you'd done and got to the boiler.

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