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Hi IanWhich controller are you using? and what age is it? also what flow rate do you have it set on?With out getting to techy the controller will be warm to touch after you have been working for a few hours. the controller have a heat sync to protect the board. If it is getting to hot to touch check the connections and wiring for any breaks or corrosion as this may also cause the unit to heat up
probably all the rain water from yesterday.....told you not to work in it