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JamesI, Developer
Category: HVAC
Satisfied Customers: 5764
Experience:  I have a portfolio of renovated houses, including DIY projects from installing bathrooms and new heating systems to rewiring.
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Vaillant eco tec plus 837 R1, heating fires up intermittent,

Customer Question

Vaillant eco tec plus 837 R1 , heating fires up intermittent, this happened after I changed the diverted valve which was leaking water, some weeks after, I've fitted a new wiring harness still the same fault , I've disconnected the diverter valve connection electrally and still it fires up when on drawing hot water rads also heat up?
JA: Do you have a multimeter or voltage tester? What colors are the wires?
Customer: The original was blue , brown, pink, black the new one came with orange , green, white, blue I thought this was the problem but after contacting 3 calls to Vaillant they disregarded this
JA: How long has this been going on with your wiring? What have you tried so far?
Customer: I've tried a new wiring harness today but same result
JA: Anything else we should know to help you best?
Customer: One tec said to check the voltage at no 3 and earth it was only 1.7v he said it should be 240v which he concluded the boiler was ok but external fault?
Submitted: 13 days ago.
Category: HVAC
Expert:  JamesI replied 13 days ago.

Hi, thank you for choosing Just Answer, my name is ***** ***** I will help with your query today.

Expert:  JamesI replied 13 days ago.

So when you say the CH kicks in your seeing the pump start even with the divert valve closed?

Expert:  JamesI replied 13 days ago.

I would start by looking where the demand for heat is coming from, and look at the programmer.