Fault Diagnosis - Rinnai REU-2018W Service Manual

21. Fault Diagnosis

Before carrying out checks marked #, remove power cord from wall plug.
Wiring diagram is on page 30.
Appliance will to operate (even remote control fails to operate)
1) Is the fuse blown?
Fuses are located in plastic holders in the
main harness, on the lower right hand side of
the appliance
2) Is the main transformer normal?
Infinity REU-2425W
Check fuse
a. Remove 240V plug from socket.
b. # Measure resistance to check the
electric fuse (3A).
Normal: less than 1
If normal, proceed to check item 2)
below.
Faulty: Replace fuse (5A)
If it blows again, investigate cause of
short circuit.
Check the transformer
c. Measure the voltage in between the
red wires of the relay connector (A
Normal: AC90 ~ 110 V / 15 ~ 21
If normal, check (d) below.
Faulty: Check for AC 90 ~ 110 V on the
PCB terminal J
black ~ black
d. Check voltages below at upper PCB
connector A.
Normal: orange -orange
AC 13 ~ 30V / 1.4 ~ 1.8
brown - grey
AC 30 ~ 50V / 6 ~10
yellow - grey
AC 180 ~ 220V / 0.4 ~ 0.6
If normal, check 3 at top of next page.
Faulty: Replace the transformer.
- 31 -
Ω
).
1
Ω
Ω
Ω
Ω
Issue 2 - 5/07/04 ©Rinnai