How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask Andrew Smith Your Own Question
Andrew Smith
Andrew Smith, Engineer
Category: UK Plumbing
Satisfied Customers: 3586
Experience:  Domestic Gas, Commercial Gas, LPG, Unvented Hot Water, Part P Electrical, Commercial Catering
46681511
Type Your UK Plumbing Question Here...
Andrew Smith is online now
A new question is answered every 9 seconds

We have a sunvic tlx 6501 programmer to control our vaillant

Customer Question

Hello,
We have a sunvic tlx 6501 programmer to control our vaillant boiler. Over the last couple of weeks the heating is coming on when we have set it to be off, e.g. at 1:30am or at random other times. If I set the sunvic to manual it works ok, but of course the heating is then on all the time. Do I need a new programmer?
Roy
Submitted: 1 year ago.
Category: UK Plumbing
Customer: replied 1 year ago.
I have had no reply at all to this question, so I trust I will not be charged this time.Regards,***** *****
Expert:  Andrew Smith replied 1 year ago.

More than likely a control problem.

Do you have a room thermostat and a motorised valve in the airing cupboard?

Customer: replied 1 year ago.
Hiya,No motorised valve and yes the thermostat is part of the programmer.Roy
Expert:  Andrew Smith replied 1 year ago.

A combi boiler then?

Which Vaillant is it?

Is it a wireless thermostat (with a receiver box under the boiler)?

Customer: replied 1 year ago.
a combi boiler. Vaillant 828, no box under boiler, thermostat hardwired.
Expert:  Andrew Smith replied 1 year ago.

Ok, I suggest you fully reset the timer as some of the times may be overlapping, this will let you set all the times agin from scratch and see if it works again.

Try this;

http://www.sunvic.co.uk/codepages/downloads.aspx?file=/media/1326189/tlx_6501_user___installation_instructions.pdf

Customer: replied 1 year ago.
Tried that twice and no joy. Went to price a programmer and was advised to remove batteries for several minutes and start up again with programming times temperature settings etc. Seems to work ok now.
Expert:  Andrew Smith replied 1 year ago.

no problem.

I thought you had done that when you replaced the batteries?

Related UK Plumbing Questions