Volvo AQAD41B Glow Plug light staying on all the time

[DougOut]

I moved my boat from Penton Hook up to Bray yesterday as Penton Hook lock is going to closed for a few weeks. Both engines started up first time with absolutely no issues but then I noticed one of the glow plug lights stayed on. Now, I've got to be honest, I didn't even know the ADAD41B had glowplugs! Does anyone have any idea of why they'd suddenly start doing that?

 

[volvopaul]

If it is a B there are no glow plugs.

 

[oldgit]

What light is staying on ? one of alarm lights below the rev counter. ?

 

[DougOut]

What light is staying on ? one of alarm lights below the rev counter. ?
View attachment 128808

My warning lights are in a separate panel but yes, it's one of those.