Noritz N-0841MC Series Manual page 2

NRC111 and NCC199 (N‐0841MC, N0842MC Series) Heat Exchanger Replacement Procedure
Procedure
1. Remove front cover
(1) Disconnect electrical power to unit
(2) Remove 4 screws
(3) Turn off gas and water
(4) Remove filter and drain unit
completely
(5) Open drain ports on the bottom of the
unit
2. Remove GFCI and circuit board
(1) Remove two screws that hold the GFCI
Plate, one screw will have a ground
wire attached), Let GFCI hang outside
of the unit
(2) Remove the ground wire that is to the
left of the circuit board
(3) Loosen wire anchor from right side of
case
(4) Remove the circuit board; there are
two screws, one on top and bottom of
the circuit board. Let the circuit board
hang outside of the unit
Diagram
Page 2