Rinnai INFINITY 26i Service Manual page 33

8. Water Flow Servo Circuit
a.)
Disconnect relay connector (B
servo.
Normal: 10~30
If normal: proceed to b.).
Faulty: Replace Water Flow Servo and Water Flow Sensor.
b.) Disconnect relay connector (
PCB unit side.
Normal: DC11~13V
If Normal: proceed to c.).
Faulty: Replace PCB unit.
c.)
Measure voltage between Brown and Grey with relay connector (B
flowing, water flow servo fully open).
Normal: < DC4~6V
Faulty: Replace Water Flow Servo and Water Flow Sensor.
d.)
Measure voltage between Yellow and Grey with relay connector (B
flowing, water flow servo fully open).
Normal: < DC1.0V
Faulty: Replace Water Flow Servo and Water Flow Sensor.
9. Heat Exchanger Outlet Thermistor Circuit
Check Heat Exchanger Thermistor if error code "33" is displayed.
Disconnect relay connector (B
Circuit break: Resistance >1M
Short circuit: Resistance > 1
Normal: Check Heat exchanger outlet thermistor
Faulty: Replace heat exchanger outlet thermistor.
Note: For controller readout of thermistor temperature whilst operational refer maintenance
monitor.
Infinity 26i and HD50i
), and measure resistance between Red and Blue on water flow
2
B ), and measure voltage between Orange (+) and Grey (-) on
2
) and measure resistance between White -White.
6
- 28 -
) connected (with no water
2
) connected (with no water
2
Issu e 1