SM102 IR problem

I have this heidelberg IR dryer SP95 which shown error.
The error code is: BD70: flow rate incorrect.
can anyone tell me how to solve this issue?
As soon as it turn on the error LED flashing up.

 

Sounds like the error could be coming from the coolant malfunctioning.
There is a flow sensor that measures the coolant is circulating properly so
maybe the coolant pump or the sensor itself may be faulty.
It could also have air in the system but the bleed valves normally takes
the air out.
Pressure could also be an issue this also needs to be checked.