A.O. Smith ADMR - 40 Installation, User And Service Manual page 69

Commercial atmospheric water heater

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Technical specifications (6 pages)

Table Of Contents

Table of Contents

Symptom

Cause

S04 (blocking error)

Flue gas sensor is not

(correctly) connected.

Open circuit from flue

Defective flue gas

gas sensor 1.

sensor

Damaged wiring

S05 (blocking error)

Flue gas sensor is not

(correctly) connected.

Open circuit from flue

Defective flue gas

gas sensor 2.

sensor

Damaged wiring

S11 (blocking error)

Short circuit in sensor

circuit

Short circuit in the

temp. sensor T2 at the

bottom of the tank

S12 (blocking error)

Short circuit in sensor

circuit

Short circuit in sensor 1

of temperature sensor

at the top of the

(1)

tank

S13 (blocking error)

Short circuit in sensor

circuit

Short circuit in sensor 2

of temperature sensor

T1 at the top of the

(1)

tank

Instruction manual ADMR

Solution

(2)

Connect the flue gas sensor lead

to JP4.

Replace the flue gas sensor T

1. Measure the wire resistance of the sensor lead. This must be

± 0 Ohm.

2. Replace any damaged leads

(2)

Connect the flue gas sensor lead

to JP4.

Replace the flue gas sensor T

1. Measure the wire resistance of the sensor lead. This must be

± 0 Ohm.

2. Replace any damaged leads

Replace sensor T

and lead

Replace sensor T

and lead

Replace sensor T

and lead

Remark

See the ADMR electrical diagram (17 "Appendices")