Trumatic C3402

[tapdave]

My 2003 fiat eriba Ducato has the older 3402 Trumanwater heater system fitted .
My van has been covered for a few weeks as we have had a bit of rain so my solar battery says I have approx 10volts power and is low , however I plugged MH in to electric and the water heating system is flashing red when I activate it , my troubleshooting manual says that this red flashing light indicates that power is not enough to operate water heater .
It’s a shot in the dark but has anybody any idea why this may be happening on electric hook up .( I have nearly 13 volts in starter battery and all seems well here )
Gas is on ! .i did have water heater working a few weeks ago but on the leisure /solar battery and was heating up fine with no hook up.
Any ideas .

Thanks in advance .

David

 

[Clivefog]

EHU will only charge the battery. The heater control runs off the battery and is detecting low power so won't start the EHU power to the heater elements. Charge the battery although I suspect it may need replacing.