- “E1” warning code must be shown blinking with a frequency of 2Hz, so the user is
aware that the water heater has automatically decreased power
Overview of ECU (electronic control unit) MPP
1- Flame detection 10- Water flow sensor
2- Ignition needle 11- Water inlet temperature sensor
3- Power plug 12- Water outlet temperature sensor
4- Fan 13- Thermal fuse
5- Remote controller 14- Thermostat
6- Water proportional vale 15- Gas valve
7- HMI 16- On-off valve
8- Wifi modulate 17- Segment valve A
9- Ambient temperature sensor 18- Segment valve B
Pict.31 – Electric Diagram MPP circuit board
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