Rinnai INFINITY 26i Service Manual page 34

H. Earth Lead.
Check to make sure that all earth leads are connected and there are no breaks or short circuits.
Checks should be made at the earth lead, pcb, power cord, and surge protector. If there is a
loose connection the Ignition electrode and flame rod will not work because they need to flash
to earth. Tighten any loose connections.
I. Remote control.
Check the voltage between the terminal connection points on the pcb. Do this with the unit in
standby mode (power on, water off)
normal voltage: 11 – 13 Vdc.
If this is correct check the remote wire for damage or shorts. If this is alright disconnect the
remote and turn on the water. If the unit operates correctly replace the remote control.
If the voltage is incorrect check the water flow servo (G) before replacing the pcb. If the
water flow servo circuit is working correctly replace the pcb.
J. Water Flow Sensor.
The water flow sensor is located inside the water heater immediately as the cold water enters
the unit. From that there are 3 wires (red, yellow, black) running to the pcb, there is a
connector plug in between the sensor and the pcb for testing. Measure the voltage with the
water heater powered up and water running through the unit. If there is a remote attached
make sure it was turned on before the water began running through the unit.
Black – Red
Yellow – Black
If Black – Red is incorrect replace pcb
If Yellow – Black is incorrect replace water flow sensor. Before you replace the water flow
sensor be sure you have checked the filter (R) and for air locks (M).
Infinity 26i and HD50i
11 – 13 Vdc
4 – 7 Vdc