If there is a weight (eg pitcher, Moose hankie ...) on the pitcher holder Perfect Moose will ask you to clear the scale before wanting to calibrate. Please do so.

In case of software upgrade or replacement of the load cell it is possible that Perfect Moose 'sees' something on the scale even if it's empty or the steam pipe moves up instead of down. This is because the load cell does not have a zero reference anymore. Try to (gently) push or pull the RFID cap (first remove the pitcher holder). To enter service mode it is also possible you will have to pull the RFID cap with the blue key on. Then preform the weight scale calibration