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AM Series Boilers and Water Heaters User Manual
CHAPTER 10 – MAINTENANCE
10.22 Control Board Replacement
The AM Series multi-burner units are configured to be driven by one control board (named
Burner 1 (Master)). On this board are connected all external devices such as: enable/disable,
outdoor sensor, pump commands, LWCO, and some internal safety devices such as blocked
drain magnetic switch, flue blocked pressure switch, etc. If the Burner 1 control board fails, the
complete unit stops functioning. If installer does not have a spare replacement part, the burner
control board from one of the other burners may be used to replace the Burner 1 (master)
control board in order to resume the function of the unit. To do so, perform the following:
Replacing the Burner 1 (Master) Control Board
1.
Turn off all electrical power to the unit.
2.
Follow the steps in Section 10.14 to remove the front cover.
Refer to Figure 10-11 and disconnect plug "B" (plug coming from display) from plug "A" (plug
3.
coming from "Burner 1 (Master).
4.
Disconnect all other plugs from the Burner 1 (Master) control board.
Loosen the four (4) screws "C" and remove the Burner 1 (Master) control board from the
5.
unit.
(C)
Four
Screws
Figure 10-11: Replacing the Burner 1 (Master) Control Board
6.
Repeat step 5 above to remove another control board from its location.
7.
Install this control board to the location where the Burner 1 (Master) control board was
installed, and reconnect all plugs to this board.
Locate S4 Switch per figure 10-11, and move from OFF (UP) to ON (DOWN) position.
8.
Replacing the Burner 1 (Master) Control Board - Continued
OMM-0100_E • GF-146 • 11/15/2019
DETAIL: Setting S4 Switch to ON
(Board Cover Removed For
Clarity)
Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST
Burner 1 (Master)
Control Board
SWITCH
Page 141 of 170
S4
ON
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