Troubleshooting; Introduction - A.O. Smith GWV - 120 Installation And Service Manual

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13.1 Introduction

Instruction manual GWV

Troubleshooting

A distinction is made between:
• General errors
General errors are not reported on the display. General errors are:
- Gas smell
- Display does not light up
- Insufficient or no hot water.
- Water leakage
- Explosive ignition.
The manual includes (13.2 "Troubleshooting table for general errors")
table with general errors.
• Displayed errors
Errors are reported on the display as follows:
- One: a code plus a brief description. The code consists of a letter and
two digits.
- Two, three and four: a long description, alternating with a
recommended action every two seconds. See the figures. The first
shows a possible error, the second shows the appropriate checking
action.
S02: SENSOR ERROR
HOT WATER OUTLET
SENSOR 1 NOT
CONNECTED
S02: SENSOR ERROR
CHECK OUTLET SENSOR
HEAT EXCHANGER
There are various types of errors, all falling into one of two groups:
- LOCK OUT ERRORS
When the cause has been removed, these errors must be reset with
the button before the appliance can resume operation.
- BLOCKING ERRORS
These errors disappear automatically when the cause of the error is
removed, after which the appliance resumes operation by itself.
The manual includes (13.3 "Troubleshooting table for displayed errors")
table of error messages that can appear on the display.
• Displayed warnings
After resolving or removing the cause, the warnings
be reset by pressing the
(13.4 "Warnings")
button and then .
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