Note: For commercial applications the
heat exchanger warranty is 2 years, from
date of original installation and operation.
For more details consult the water
heater's installation manual for warranty
• Phillips head screw driver
• Needle-nosed pliers.
Note: Avoid touching printed circuit board
as static discharge may damage circuitry.
B Push power button to "OFF" and unplug power cord.
B Loosen two Phillips head screws on bottom rear of
front cover. Pull cover bottom outwards then lift
cover upwards to remove.
Removing control unit
B Remove three Phillips screws on front of control unit.
(Fig. 1, pos.1).
B Turn control unit to expose the rear. (Fig. 2, pos. 2).
Control unit front
B Remove rear cover from control unit to expose circuit
board electrical connections. (Fig. 2).
Control unit rear (wiring not shown for clarity
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