Installation and Operation Manual

74 Rinnai Tankless Water Heater Installation and Operation Manual
71
Solenoid Valve Circuit
• 

• 

• 
• 
72
Flame Rod
• 
• 
FF
Maintenance Indicator
• 


• 

󰀨
• FF
SS
(SS) Service Soon (Flush Heat
Exchanger)
• SS



SS
• 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
• 

• 

• 
• 


