Discription
Part No: - 0020244337
Genuine Vaillant Part Not a cheap Chinese make.
This is a 3 wire, wiring kit for the Vaillant Heat only boiler range where you are unable to install with a 5 wire installation
These are a purpose designed unit to stop voltage being stored in components of the PCB and eventually surging back and damaging control components throughout the rest of the system, for example Programmers / stats / valves etc
When first brought out Vaillant and Glowworm Heat only boilers were listed as a 3 and 5 wire option, however the 3 wire option was immediately withdrawn on an update until this unit was produced to rectify the issue
Absolutely necessary if you only have a 3 core cable - SL / Neutral + Earth at the boilers location