The manifold cabinet had poor access to the manifolds and the actuators. Please note the master unit. It is mounted on a flapping sheet of plywood next to the actuators.


Switch off the power by unplugging the power plug to the master unit. When the power is turned ON, the left LED will lit.


In order to remove the actuators we began to mount the master unit higher up and the wall was sawn up at the bottom to be able to access the balancing valves on the return manifold. Upon inspection it appeared that all the valves were in fully open position. Therefore could not the circulation pump push the warm water to the rooms farthest away.


  1. Make sure that no dirt blocking the (actuator) valve needle. This is done by.....