Installation Manual

Rinnai Tankless Water Heater Installation and Operation Manual 75
71
Solenoid Valve Circuit
• 
the OFF position.
• 

• Ensure heater circuit is not grounded.
• Replace PC Board.
72
Flame Rod
• 
• 
FF
Maintenance Indicator
• 


• 

󰀨
• FF
SS
(SS) Service Soon (Flush Heat
Exchanger)
• SS


details on setting and changing the SS
indicator.
• SS



Hard water must
be treated to prevent scale build-up
or damage to the heat exchanger.
• To reset the SS󰀨




FF
NO CODE - Nothing happens when
water ow is activated
• 

• 

• 
• 


troubleshooting resources.