American Water Heater 160X3P Manual page 24

and obstructions in the
venting or heater will affect
manifold pressure readings.
9. Contact Technical Support
regarding the manifold pressure.
(See Table 1 on page 4.) With
approval from Technical Support,
adjust the manifold pressure to the
correct values, if necessary.
Reset Procedure
10. Complete the following procedure
to clear the 101/521/991 error
code:
10.1 Make sure that the water
heater is powered on.
10.2 Press the on/off bu on on
the remote/temperature
controller so the amber
standby light is off .
10.3 On the computer board,
simultaneously press and
hold the INCREASE and
DECREASE bu ons for fi ve
seconds. (See Figure 11 on
page 30.)
10.4 Release the bu ons when
the green LED on the
computer board turns on.
The green LED will then turn
back off .
10.5 Shut off power to the heater
using the on/off switch
above the computer board.
10.6 A er 5 seconds, turn the
power on. Press the On/
Off bu on on the controller
to place the water heater
in standby and ready for
opera on.
24 • On-Demand Water Heater Service Handbook for X3P Models