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 Plumberpro Your Own Question
Plumberpro
Plumberpro, Home Appliance Technician
Category: Appliance
Satisfied Customers: 634
Experience:  Heating and hot water heating appliances experienced
77408428
Type Your Appliance Question Here...
Plumberpro is online now

I have a Vaillant Ecotec Plus 831. The hot water works fine

Resolved Question:

I have a Vaillant Ecotec Plus 831. The hot water works fine but the radiators are only lukewarm even though I have set the thermostat to 35 degs and the flow temperature to 70 degs. I have checked each radiator and there is no air. The flow temperature does not seem to go above 36 degs at any time when the heating is on.
Submitted: 2 years ago.
Category: Appliance
Expert:  Plumberpro replied 2 years ago.
Plumberpro :

Hi . what pressure do you have on the boiler gauge ?

Customer:

The pressure bar is between the two dotted lines on the display.

Customer:

Which I understand is correct

Plumberpro :

Ok . if hot water is running ok and the heating comes on but is lukewarm then your heating temperature sensor/thermistor is faulty and needs replacing

Customer:

Ok is that on the boiler or the thermostat unit?

Plumberpro :

On he boiler

Customer:

ok thanks

Plumberpro :

Your room stat is turning the heating on and they tend to be other work or not , so it will be your boiler heating temp sensor

Customer:

Ok I see thanks, ***** ***** it replaced

Plumberpro :

Your welcome

Plumberpro and other Appliance Specialists are ready to help you