Primary or backup display switch pushes are either unresponsive or produce incorrect/unusual results.

Suspect a broken switch. First push the suspected switch in fully and hold in. Second remove the wire C clip with a dental spike. Third carefully release the switch and remove it and the switch spring. If the switch is broken into 2 parts replace it. If the switch is not broken first check the second switch in the display in question. If neither switch is broken replace both and test as a switch may loose its magnetism. If no switches are broken and replacing switches does not solve the problem suspect Reed switch damage and contact Avon Underwater Systems for advice.

Further Resources

Assembly & Testing Document

Video Link: Switch Removal and Replacement