Called out to Pillings lock marina. Webasto playing up – not starting up and for some time has been taking longer to warm up.
Main fault is that water has got inside the power plug and damaged a terminal in the plug and burnt one of the pins. This fault isn’t that uncommon and Webasto dealers would be changing the circuit board and plug (£300+). If the heater timer is left on it’s possible fuel is dumped into the exhaust as heater continually momuntarily switches on and then off as voltage at the pin drops out under glowpin load.
Only proper way to fix is to solder leads directly to the pins – cables properly soldered to the pins, sealed using adhesive lined heat shrink and then silicon which is hard to see in the photo. This is a 100% reliable fix.
The problem with the heater taking longer to warm up than normal is down to fuel supply issue. The original installer had T’d into the engine feed after a pre filter which is most likely partially blocked. This is a really common error and done to save time in the installation.
Best to install the Webasto fuel supply properly with dedicated feed taking diesel from around 6 inches off the bottom of the tank. Heater now runs perfectly.