Rev. A 9/2016
ETi 400
High Efficiency Pool and Spa Heater Installation and User’s Guide
49
Section 3: Troubleshooting
Diagnostic LEDs: PS, HLS, TF, IGN, AFS, AG1, AG2, FS
FS is on
Check if the condensate hose is
clogged with dirt and is not
draining properly.
NO
YES
Verify stack flue temperature
is lower than 187° F (86° C)
NO
NO
YES
tf is on
Replace thermal fuse.
Service heat exchange or call
customer support.
Remove dirt and clean
float switch.
Remove condensate collector
and verify float switch can freely
move up and down.
Replace condensate collector.
YES
Clean condensate hose and
neutralizer cartridge.
Is the Stack Flue temperature
over 172° F (78° C)
NO
YES
Replace Stack Flue sensor
and thermal fuse and service
Heat Exchange or call
Customer Service.
