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Brian, Plumber
Category: UK Plumbing
Satisfied Customers: 840
Experience:  16 yrs. experience as plumber, including full bathroom and kitchen installations.
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I have vaillant ecomax pro 18e and just today I drained it

Customer Question

I have vaillant ecomax pro 18e and just today I drained it out and refilling and taken all the air out when I turn it on it comes up with fault code 5 and flashing red light at the top. It happens straight away as I turn it on. Was working fine before. any advice will be greatly appreciated.
Submitted: 1 year ago.
Category: UK Plumbing
Expert:  Brian replied 1 year ago.

F5 is an overheat fault unless there is a fault with a thermistor or themostat you should be able to reset it.

It probably happened due to air being trapped in the heat exchanger off the boiler

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