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Maintenance and service
39
6.7
Control board diagnostics
1. Press ON/OFF button to turn off the appliance.
2. Press and hold "Program"
button and press
ON/OFF button to turn appliance ON.
3. Release the
button when '188' appears on the
display. The display should read 'P2' when the
program button is released. If not, repeat process.
4. Press and release the
button on the control
panel until the display reads 'P4'. You are now in the
diagnostic mode of the control board.
5. When the display reads 'P4', press and release the
button once again and the display should read
'E'.
6. Use the
and
button on the control board to
cycle through different diagnostic modes available.
7. Once in the selected diagnostic mode of your
choice, press and release the
button to display
the diagnostic information.
EXAMPLE: to read the flow rate in gallons per minute
while the unit is flowing water, cycle to the '3d' mode
and press the
button. A reading of 25 on the dis-
play would indicate the heater is reading a flow rate of
2.5 gallons/minute.
8. Once the information is obtained, press the
but-
ton again to return to the diagnostic mode menu and
scroll to addition diagnostic information.
9. Press ON/OFF button to turn OFF the appliance and
back ON again to return heater to normal function.
Diagnostic menu
E
Entry/Exit into sub-modes
0d
Set-point temperature
1d
Inlet water temperature (°F)
2d
Outlet water temperature (°F)
3d
Water flow (gallons/min)
4d
Gas type (LP or NG)
5d
Fan speed (Hz)
6d
Burner power (%)
7d
Maximum power (kW)
8d
Back flow temperature (°C)
9d
Exhaust temperature (°C)
1F
Most recent error/failure
2F
2nd most recent error
3F
3rd most recent error
4F
4th most recent error
5F
5th most recent error
6F
6th most recent error
7F
7th most recent error
8F
8th most recent error
9F
9th most recent error
10F
10th most recent error
Table 19
