Rheem 874 Owner's Manual And Installation Instructions page 70

COMMISSIONING
Notes:
If the burners extinguish and error code 11 or 12 starts to flash on the LED display:
release the MIN and adjuster buttons

close the hot tap

recommence the procedure from Step 8.

If the adjuster button is released before Step 13, clear any error code (if displayed) and recommence the
procedure from Step 8.
Maximum test point gas pressure
Refer to the rating label on the water heater for the maximum test point gas pressure.
Follow Steps 8 to 14 of the
but open the hot tap fully and use the MAX button instead of the MIN
button. It may be necessary to open two or three hot taps fully, depending
upon the model of water heater and the incoming cold water temperature.
Note: In Step 9, "3H" (874627 and 872627 models) will be shown on the
LED display.
After setting the minimum and maximum test point gas pressures:
Close the hot tap.
Remove the manometer and refit and tighten the test point screw and washer.
Open a hot tap again so the burners ignite.
Test for gas leaks.
Close the hot tap.
Turn off the controller, if one is fitted, by pressing the on / off button
Switch off the electrical supply at the power outlet to the water heater
LED DISPLAY - TEST POINT GAS PRESSURE
Refit the front panel and screws to the water heater.
CONTINUOUS FLOW WATER HEATER
Clearing Error Code
86,87 SERIES, O22,024,027 MODELS
If an error code does appear on the LED display during the installation and commissioning process, it will be
necessary to clear the error prior in order to complete the installation.
To clear an error code:
switch off the electrical supply at the power outlet to the water heater
check the gas isolation valve at the gas inlet to the water heater is fully open
wait five (5) minutes
switch on the electrical supply at the power outlet to the water heater
"Minimum test point gas pressure"
procedure,
70