8.5.2.3 Protective cut-out for solenoid valve A PTC, connected in series to the solenoid valve, serves as a current limiter (i.e. overheating cut-out) in the following cases: If the triac on the main PCB is short-circuited If the START/PAUSE button is pressed repeatedly (more than 10 times) 8.5.3 Electrical symbol 8.5.4 Circuit diagram 1. Main switch 2. Solenoid valve 3. PTC protective solenoid valve cut-out 4. Bi-metal PTC 6. Connector SOI/DT 2002-05 eb 66 599 35 23-17