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  1. R

    Vaillant ecotec plus 418 Boiler wiring problem

    Thanks for the info. Simond right, problem was an earth fault on the switched live. A small nib of wire protruding from a row of Choc boxes earthing onto the metal patress box. Problem solved. Thanks to all who wrote in. Cheers Ray
  2. R

    Vaillant ecotec plus 418 Boiler wiring problem

    Again thanks for the reply, the Pos live switched feed is from the zone controls, however the No4 terminal has a negative feed through the pcb. Therefore when the switched feed is connected to No4 there is a dead short and the rcd trips. Any help appreciated.
  3. R

    Vaillant ecotec plus 418 Boiler wiring problem

    Thanks for the reply, however when connecting the switched live to the No 4 terminal, the House rcd tripped. Checked No 4 terminal and found that when meter connected to Line +Pos (Boiler) and No 4, meter read 230 Volts, therefore it appears that the No 4 terminal is getting a Negative feed...
  4. R

    Vaillant ecotec plus 418 Boiler wiring problem

    Help required with the wiring of a Vaillant ecotec 418 Boiler. No 4 terminal on the PCB: should this be voltage free ie the switched live for the boiler, as this terminal has a negative feed when checked with a meter. can anyone help with this problem Thanks in anticiption
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