Rinnai REU-K2430WG Service Manual page 27

8. Flame Rod Circuit
Check flame rod.(I ) Yellow - flame rod.
4
Over DC1µA
Disconnect flame rod terminal (I
"72" indicated:- Proceed to 3. Main Solenoid Valve (SV
"72" is not indicated:- check for electrical leaks from the flame rod.
Measure resistance between flame rod terminal (I

Normal: >1M
If normal, replace PCB.
Faulty: Replace flame rod.
a.) Remove the Flame Rod terminal (I
check the Hot water outlet thermistor.
If "72" is not displayed check current leakage from the Flame Rod.
b.) Measure voltage between body earth and Flame Rod terminal (I
Normal: voltage AC100~160V
If normal, replaced PCB
Faulty: Replace Flame Rod.
c.) Check if the Flame Rod is securely fitted.
Normal: replace the PCB
Faulty: Adjust the fitting of the Flame Rod.
9. Thermal Fuse Circuit
Check the Thermal Fuse.
Disconnect relay connector (I

Normal: < 1
If normal, replace PCB.
Faulty: Replace Thermal Fuse if after confirming there is no damage to appliance.
10.Water Flow Sensor
a.)
Measure voltage between Red-Black of relay connector (E
Normal: DC 11~13V
If normal, proceed to
Faulty: Replace PCB.
b.)
Measure voltage between Yellow-Black of relay connector (E
Normal: DC 4~7V
If normal, proceed to 2.Sparker Circuit.
Faulty: Replace water flow sensor.
Note: For controller readout of water flow whilst operational refer maintenance monitor.
(Chapter 17) No. 1.
REU-K2430WG-AK (Envirosmart )
REU-K2430WG-AK
), and re-operate.
4
4
) repeat operation procedure, if "72" is displayed again
4
) & (E ) measure resistance between red and red.
1 1
b
.
- 23 -
)
0
) and appliance earth.
).
4
).
2
).
2
Issue 1 - 16/12/09 ©Rinnai