is your printer a z310? or Z3100
Is it a z3100 than i can send you a service manual if you like
The manuals are available on the Z3100 Wiki pages but I think Thomas is aware of that.
The error code isn't mentioned for its full length but 52 should refer to the drop detector.
If you read comments about the drop detector you may find the cause.
I think a power down and up is one of the first things to do.
When heads fail I do not think it gives an error like that but I have no heads failing so far.
Be aware of the climate conditions right now in Northern Europe.
Colder, dryer, more electrostatic phenomena.
met vriendelijke groeten, Ernst Dinkla