Rinnai HD200E REU-V2632WC, Service Manual

Page: 34 / 68

Infinity REU-V2626W / HD200E REU-V2632WC - 29 - Issue 1 - 10/10/03 ©Rinnai
3d.Valve Circuit
a.)
Disconnect Solenoid connector (E
4
), measure resistance between Brown and Black.
Normal: 1.7~2.0k
Ω
If normal, proceed to
b
.).
Faulty: Replace Solenoid Valve 3.
b.)
Measure voltage between Brown and Black of SV
3
connector.
Normal: DC80~100V
If normal, proceed to Modulating valve
circuit.
Faulty : Replace PCB.
c.)
Disconnect Modulating Valve fasten terminal and measure resistance between terminals.
Normal: 6 7~81
Ω
If normal, proceed to
b
.).
Faulty : Replace Modulating Valve.
d.)
Measure voltage between Pink and Pink of Modulating Valve fasten terminal.
Normal: DC2~15V
If normal, proceed to
c
.).
Faulty: Replace PCB.
e.)
Check the gas secondary pressure change when set temperature on the remote control changes
from 37 to 55
°
C.
Normal: If secondary pressure changes, go to Water Flow Servo Circuit.
Faulty: Replace Modulating Valve.
4. Flame Rod Circuit
Check flame rod.
Disconnect flame rod terminal (C
1
), and re-operate.
“72” indicated:- Proceed to 3.
“72” is not indicated:- check for electrical leaks from the flame rod.
Measure resistance between flame rod terminal (C
1
) and appliance earth.
Normal: >1M
Ω
If normal, replace PCB.
Faulty: Replace flame rod.
a.) Remove the Flame Rod terminal (C
1
) repeat operation procedure, if 72 is displayed again 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 (C
1
).
Normal: Voltage AC5~150V
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