Heater/Goldline Aqualogic and more

bo is normal display when heater is being controlled by a remote thermostat.

No service is required.

If heater is not being controlled by remote thermostat, change setting by using the MODE key to put the heater into STANDBY.

Press and hold the DOWN key and then press and hold the MODE key.

Hold down both keys for 3 seconds until the indication ‘‘bO’’ is removed from the display.

If the display will not change, then the keypad is probably bad.
Thanks - I think this is it - may not be the only problem - but it's where I will start. I can't get it out of bo and no other error code comes up. the light being out and showing ho threw me. Thanks for your help and all the links. Now to find the part.
 
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The keypad sits over the display board.

The clear window sits over the display board LED.

The 4 pin connector connects the keypad to the display board.

The 4 pin should be a common and then one wire for Up, Down and Mode.

You can trace the wires to see which trace goes to the Up Button, Down Button and Mode Button.

Closing the common to the pin makes the function happen.

For example, closing common to up makes it go up.

Peel off the membrane pad and show the back.

Put waterproof tape over the opening.

Shut off power to the heater until you can replace the keypad and bezel.





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keypad.jpg
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Generic Chinese Keypad, Bezel and Display.


My guess is 1 is common and 2, 3 and 4 are Up, Down and Mode, but you can verify.

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The traces will be something like this.

A trace will go from a pin to a button.

Each button will also go to common.


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