- The proportional band is too narrow and the P constant is too small.
- The integral time is too short and the I constant is too small.
- The derivative time is too long and the D constant is too large.
- It is in ON/OFF control mode.
- The control cycle is too long for a control system with fast thermal response.
The overlap band setting is mistakenly set for a dead band setting in heating and cooling control.
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