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GFCI - jacuzzi lights - heater problem. and circ.pump on slow speed


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Hello I have some problem with my spa:

Jacuzzi Model: E781VM maax spas
Controller: Balboa 760E
GFCI: hager model CDC440J.
Lights controller: SloanLED LiquaLED Control 40

1.
When I dont use a lights, heater functionally normal with jets etc.`
When I don`t use a heater, lights functionally normal with jest etc.

When spa lights are on and I switch on heat, trips GFCI (hager model CDC440J).
I try to disconnect a light from mainboard but it`s still the same, when I switch lights on [with disconnected controler or not] when heater is on, GFCII is triggered.

please, have you got some ideas what to check?
I have tried: disconnect light controller from board, disconnect ozone/uv, disconnects lights from lights controller.


2.
Circulation Pump on standard mode:
[in fast speed] functional normal
[in slow speed] stopped after 10s-10min, DR/LF fail.

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We have a Dim1 19 DT 2007 model. The Spa side failed like this some time ago. You mentioned 

I have tried: disconnect light controller from board, disconnect ozone/uv, disconnects lights from lights controller.

So your headed in the right direction on the TS path. Drop components and reset GFCI each time for starters to see where it "faulting" or which part is having issues. 

The Balboa pack is one the newer ones, easier to R & R heater elements vs indirect tee bone type by pass heater setups. Some of them have a "Relay Board" on the mainboard that fails and can be replace with a bit of knowledge & skill.

Our problem was a bad relay on the main board. Replaced the board and was operational. Kept the old board for reuse as parts are getting more expensive.

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