Could be a few things, air vent leaking, either of the two heat exchangers leaking, condensate trap or sump leaking.
When was it last serviced? Is it a sealed system with a pressure gauge or open system with header tank in loft etc?
Could be a few things, air vent leaking, either of the two heat exchangers leaking, condensate trap or sump leaking.
When was it last serviced? Is it a sealed system with a pressure gauge or open system with header tank in loft etc?
It's an Icos has one hex. Looks like water has tracked down the cable?
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