While you wait for answers, we may have found some information which could help you.
Success
Message
pressure switch?
no domestic hot water?
Fan light flashing?
max of 50 degrees hot water?
what does F14 mean and F5?
water goes cold during shower?
were do I get a diagram and information on airpressureswitch 105he?
water sensor?
no hot water and pressure valve is on red and water is leakiing outside?
charging system up?
gas neoon flashing?
burner going of after 2 or 3 minutes and on?