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Diatem controller failure
Good morning prople.

My neighbour has asked me look at his  Diatem Intercom as it has failed.

The unit is a Daitem sc902 au with the keypad and call button keypad.
the Controller is an SC200AU the keypad is an MHF02X

The handset in the house is powered up but cannot see the outdoor unit

The controller has 24v but nothing lit up on the board and nothing lit up on the keyboard.

Obviously, either the controller or the keypad is broken, but is there any further testing I can do to establish whether I just need a replacement control board or is it the keypad or both?

To replace the whole system seems a little overkill at £450 ish so would prefer to identify and replace the correct part(s).

Any advice would be appreciated.

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