8.8.3 Electrical symbol 8.8.4 Circuit diagrams and operating frequency 8.8.5 Checking for efficiency In the event of a fault in the pressure switch, the operation of the appliance is immediately interrupted. Where possible, always read the alarm code. Possible alarm codes caused by faults in the pressure switch: ѓ MWM 1.5 : E30, E32, E33, E36 ѓ EWM2000 : E31, E32,E33, E34, E35 SOI/DT 2002-05 eb 72 599 35 23-17 Version for MWM1.5 control systems Version for EWM2000 control systems