This sequence deacription does not match your timing diagram.
1- hot + cold for short time then drain
2- hot + cold for short time then drain
3- hot + acid for nearly 15 mins then drain
4- hot + cold for short time then drain
5- hot + cold for short time then drain
Timing diagram says:
01. Hot and Cold water Valves ON for 5 minutes;
02. Pump and Agitator Contactor ON for 2 minutes;
03. Drain Valve ON for 2.5 minutes;
04. Hot Water Valve and Acid Valve ON for 15 minutes;
05. Pump and Agitator Contactor ON for 15 minutes;
06. Drain Valve ON for 3 minutes;
07. Cold Water Valve ON for 5 minutes;
08. Pump and Agitator Contactor ON for 2 minutes;
09. Drain Valve ON for 3 minutes;
10. Cold Water Valve ON for 3 minutes;
11. Pump and Agitator Contactor ON for 1 minutes;
12. Drain Valve ON for 2 minutes;
Which version is correct: Your description, or the timing diagram?