12v irrigation solenoid getting really hot!

[Vendril]

Hi,

Using ESPHome and HomeAssistant.


Have hooked up a 12v irrigation solenoid (normally closed) to relay 8 but it is getting really hot even when it is off. 

I have it wired and coded like this:

12v jumper cable (from the board power) to the (COM) on relay 8
GND jumper cable (from the board power) to the solenoid
(NC) to the solenoid

Code:

  - platform: gpio
    name: "relay8_solenoid back wall spinkler"
    id: relay8
    pin:
      pcf8574: pcf8574_hub_out_1
      number: 7   # relay 8
      mode: OUTPUT
      inverted: true

Thanks,