AM Series Boilers and Water Heaters User Manual
CHAPTER 10
– MAINTENANCE
OMM-0100_E
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GF-146
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11/15/2019
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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.
3.
Refer to Figure 10-11 and disconnect
plug “B” (plug coming from display) from plug “A” (plug
coming from
“Burner 1 (Master).
4.
Disconnect all other plugs from the Burner 1 (Master) control board.
5.
Loosen the four (4) screws
“C” and remove the Burner 1 (Master) control board from the
unit.
Burner 1 (Master)
Control Board
DETAIL: Setting S4 Switch to ON
(Board Cover Removed For
Clarity)
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.
8.
Locate S4 Switch per
figure 10-11, and move from OFF (UP) to ON (DOWN) position.
Replacing the Burner 1 (Master) Control Board
- Continued
ON
(C)
Four
Screws
S4
SWITCH
