Just started getting a Service 20 error with our Grohtherm Wireless shower. It's been in use for about 4 years with no problem. The shower display says WAIT, it then runs ok for a few minutes but then stops with the above error message. Any ideas please
check the inlet filters first.
isolate the hot/cold feeds and release the inlet pipes and check the filters.
hold a towel under pipes when you release them.
is it letting a short burst of water through then nothing ?
Hi, thanks for your reply, that might be a bit beyond my competence!!
Once the Wait message goes, the shower seems to work ok with a good flow of water, it then cuts out after a minute or so and gives the error message.
Hi, Just to say many thanks again for your advice. A local plumber has now checked the filters and attempted to clear any airlock with a wet-vac. The shower is still cutting out after about a minute so I guess it's over to Grohe under warranty. The plumber thinks it might be a faulty cut-out switch somewhere.
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