ETi 400 High Efficiency Pool and Spa Heater Installation and User’s Guide
Rev. A 9/2016
44
Section 3: Troubleshooting
Heater Will Not Fire - B
Start
Increase POOL/SPA tempera-
ture setting on Membrane
Pad above actual water tem-
perature. Heater should fire
on demand for heat. If not,
and no other red LED’s light,
replace Control Board.
Service pump/filter and elimi-
nate other flow obstructions.
Heater should fire on call for
heat. Re-verify that water flow
is above minimum require-
ment.
Minimum Flow Requirements
Model Flow (gpm)
minimum.
If water pressure is outside of
adjustment range that will
open switch with pump off
and close switch with pump
on, replace with flow switch
set above minimum flow
requirement.
Is Red SERVICE
SYSTEM LED ON
YES
YES
NO
YES
NO
NO
Is Red SERVICE SYSTEM
LED on?
Verify that pump is on, filter is
not blocked, and the water
flow is above the minimum
requirement.
Check that water pressure is
within the adjustment range of
the Pressure Switch (0-5 psig).
Verify that switch wiring is OK
and Pressure Switch port is
not blocked, and replace
water Pressure Switch.
GO TO
Dianostic LEDs page 45
Go to Diagnostic LED’s,
(Page 45)
With pump running, adjust
Water Pressure Switch to
lower pressure until SERVICE
SYSTEM LED goes out.
Then verify that SERVICE
SYSTEM LED goes on with
pump off.
YES
YES
YES
NO
NO
NO
CONTINUE
Minimum Flow Requirements
ETi 400 40
Press POOL Up arrow
button together.
Is there a three (3) alpha numeric
numeric fault code displayed
on the LCD?
Temperature
rise (˚F)
30 +/- 5 ˚F
Model Flow (gpm)
minimum.
ETi 400 40
Temperature
rise (˚F)
30 +/- 5 ˚F
Check the temperature at the
water outlet plumbing from the
tridicator and subtract the water
inlet temperature on the LCD.
The difference is the
Temperature Rise (˚F)
.
