The on-off cycle in the master timer should go on only for the set time (here it is 18 minutes). Once the master timer goes off, the cycle should stop. To achieve this, the outputs of both the timers are connected to NAND gate N1 (IC3), which gives a low output only when both the timers are giving high outputs.The output pin 3 of N1 is connected to relay RL1 via pnp transistor T1, so the relay energises only when the output from NAND gate N1 is low. As the mains 220V line is taken through relay RL1,the monitor turns off during the 3-second off period after the set time of 10 seconds is over.
A defective water heater element prevents the water from heating in a washing machine. Some hints are provided in this content to check whether you have an out of order heating element in your washer. There are ways to make sure if you have a water heater element in your washing machine, which is not working. If the fuse or circuit breaker blows within a few minutes of turning on your washing machine, there is a chance the fault is with the systems heating element.