Paloma PH2-20R OFN, Engineering Handbook

Page: 16 / 172

16 | Page SVC 820 Tankless Gas Trouble Shooting Manual
16
Maintenance Mode Panel Display
The Rheem Tankless has a Maintenance Mode chart on the Remote Control.
To access the Maintenance Mode, turn the unit OFF at Remote Control. Then
hold down the UP and DOWN arrow keys at the same time for 5 seconds.
You will hear an audible beep and see the display go to 1E. By pressing the
UP and DOWN arrow keys on the remote thermostat, you can access a
variety of information about the water heater. To activate the unit while
displaying the maintenance panel: push the power button once, open a hot
water fixture, and the green LED will illuminate. This will allow you to access
a variety of real time information while the unit is in operation.
Shortcut: Lift dip switch #1 to the up position to go immediately into maintenance mode. This can be
done while the water heater is in operation.
While in Maintenance Mode you want to push the up arrow key to select the table you wish to view.
The table is designated by a letter and is always displayed as the second digit. Then push the down
arrow key to display the number item in the table you selected. You can select as many as 8 readings
for each table.
To perform diagnostics in this service manual, press the up arrow until you get to table
1Y
.
Now using your down arrow you can change the number in front of
Y
. As you move through the
diagnostic readings, the selected table will flash first and then the diagnostic reading. You will see the
following as you navigate the
Y
table:
0Y = Flame Rod Status
1Y = Water Flow in gallons per minute
2Y = Ambient air temperature
3Y = Water inlet temperature
4Y = Heat exchanger temperature
5Y = Hot water outlet temperature
6Y = Fan speed (x 100 rpm)
7Y = Power for modulating gas valve
8Y = Null (no reading)
9Y = Null (no reading)
*FULL MAINTENANCE DISPLAY CHART AVAILABLE ON NEXT PAGE*