I get a ‘TPM NO-COMM’ alarm during the dive.

During the dive turn off the TPM to suppress the Alarm by following steps; From the main dive screen Long push right button then a long push on both buttons to get into DVO and scroll round to TPM and turn it off, then return to main dive screen. The problem is most likely caused by corrosion on the TPM 7 pin connector. Use a contact cleaning fluid or white vinegar and a soft brush to clean the TPM (Male) and Canister (Female) cable ends. Lightly grease around the metal section of the TPM (Male) end and re fit.

Further Resources

Assembly & Testing Document

Video Link: TPM Removal
Video Link: TPM Replacement
Video Link: Optocon TPM Removal
Video Link: Optocon TPM Replacement