Rinnai B20 Service Manual download pdf (Page 28)

REU-2532W Series 28 Rinnai

16. Operation Flow Principle

Check power supply

Fuses/electrical

circuit operational

combustion fan operates

Fan initial power flow abnormal

Thermo fuse melted

Solenoid valve circuit faulty

Failed to sense flame circuit

Combustionfan rpm's abnormal

90 Flashing

61 Flashing

72 Flashing

71 Flashing

52 Flashing

32 Flashing

14Flashing

Remote control

signal normal?

ON/OFF switch ON

Set Temperature displayed

Hot water tap open

water flow greater

than 0.6 gpm's

Combustion fan pre-purges

Initial check

normal?

Fan rpm check

Solenoid valve SV2 OPEN

Solenoid valve SV0 OPEN

Main gas valve SV1 OPEN

Sparker ON

Solenoid valve SV3 OPEN

Solenoid valve SV0 Closed

Solenoid valve SV1 Closed

Solenoid valve SV2 Closed

Pre-purge of combustion fan

(2 seconds)

Overheat bi metal switch faulty

Modulating solenoid valve faulty

Modulating valve Closed

Solenoid valve SV3 Closed

Sparker OFF

Eliminate cause

Disconnect power

supply

Remote control indicates no

flow OFF

ON/OFF Switch

Error display OFF

Water flow sensor stopped

Combustion fan OFF

Hot water tap closed

(after 5 seconds)

Error code displayed on remote

61 Flashing

Modulating valve Closed

Solenoid valve SV0 Closed

Solenoid valve SV1 Closed

Solenoid valve SV2 Closed

Solenoid valve SV3 Closed

D

C

(after 4 seconds)

Thermistor faulty

No

Yes

Yes

Yes

Yes

Yes

Not OK

(12.5 seconds after A)

B

No

No

No1

2

3

4

4

6

7

8

5

4

9

10

11

12

13

A

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