The manual water supply function of hotel central hot water is invalid, and so is the manual water supply.

In the following cases, automatic and manual water replenishment will fail:

1. The power cord from the control cabinet to the solenoid valve (or electric valve) is short-circuited or disconnected; You can manually open the control cabinet with a multimeter to measure the voltage at the solenoid valve. If yes, the case of 1 can be excluded. If there is no voltage, further testing is required.

2. If the solenoid valve (or electric valve) is damaged, and there is no sound or water flow sound after being electrified, it can be judged that the solenoid valve (or electric valve) is damaged.