Pentair ETi 400 Installation And User Manual page 50

Section 3: Troubleshooting
50
Diagnostic LEDs: PS, HLS, TF, IGN, AFS, AG1, AG2, FS
SFS on
Heater starts and runs OK,
but temperature of exhaust
climbs to 170°F (77°C)
in 3-5 minutes.
NO
Heater starts after several
tries, exhaust temperature
stays below 150°F (65.5°C)
OR
Heater doesn't start at all
(exhaust stays cold).
YES
Check pressure and volume
of fuel supply
OK
Disconnect the sensor and
check continuity across its
terminals. Resistance
should see:
= open circuit
0 = shorted
Does sensor check OK?
See Resistance Table on right.
YES
Check continuity in wiring
harness between Control
Board and Probe.
YES
Continuity OK?
NO
Check the J5 and J8
connectors for corrosion/
looseness on the male
pins.
YES
Clean/tighten pins as
needed.
DONE
Reset power to Heater
and retry. Heater should
fire.
ETi 400 High Efficiency Pool and Spa Heater Installation and User's Guide
Check Heat Exchanger
Coil for leaks, liming, soot,
or low flow.
YES
Heater should fire on call for
YES
heat. Re-verify that water flow
is above minimum require-
ment.
Minimum Flow Requirements
Model Flow (gpm)
minimum.
ETi 400 40
Check the temperature at the
water outlet plumbing from the
tridicator and subtract the water
inlet temperature on the LED.
The difference is the
Temperature Rise (˚F).
NO
Correct problem; Heater should
fire.
NOT OK
Correct Fuel Supply, reset
Heater and retry. Heater
should fire correctly.
NO
NO
Replace Stack Flue Sensor
DONE
Reset power to Heater and
retry. Heater should fire.
NO
Repeat checks on fuel
supply, Thermal Regulator,
check for correct orifices,
etc.
YES
NO
Does the Digital
Temperature Display show
Error Code "E05" or "E06"?
NO
NO
YES
Temperature
YES
rise (˚F)
30 +/- 5 ˚F
Replace Heater Control Board.
Reset power to Heater and
retry. Heater should fire.
NO
Replace Heater Control Panel.
Reset power to Heater and
retry. Heater should fire.
Resistance Table
T (˚C) - Rn (Ohm) *
0 27396
5 22140
10 17999
15 14716
20 12099
25 10000
30 8308
35 6936
40 5819
45 4904
50 4151
55 3529
60 3012
65 2582
70 2221
75 1918
80 1663
85 1446
90 1262
95 1105
100 970
Note: (*) +/- 3%
DONE
NO
DONE
Rev. C 4/2017