Washing Machine Diagram / August 28, 2018 / Maylee Weldon.
Typically, washing machine pressure switches have a large sensing diaphragm that's about 60mm or so in diameter and three quick-connect male terminals. One connection is common, while the others are for normally open (NO) and normally closed (NC) connections. A set-point adjustment mechanism is built in (it's directly controlled by the 'water level' knob) and the switch opens and closes with audible clicks.
At times you may feel your laundry is not coming out as clean as it used to be, then also you can doubt the possibility of an error in the heating element. Most probably the clothes might not be getting hot water and consequently they might be getting washed in cold water!
If your washing machine blows a fuse or circuit breaker within a few minutes of turning it on, this could be many things and would need further testing but one of the things that could be causing the fuse to blow is a faulty water heater element.If your wash is not coming out as clean as it used to, this again could be a indicator of a faulty element as the clothes could be washing in cold water.
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.