A.O. Smith TWI 35-200, Installation, User And Service Manual

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12 Troubleshooting
12.1 Errors and warnings
The water heater can have three different kinds of errors:
• General errors (see 12.1.1), which are not displayed
• Displayed errors (see 12.1.2), which are divided in two different groups:
-
Lock out errors: when the cause is removed, you can reset the error to resume
operation. The code is displayed continuously and the exclamation mark blinks.
- Blocking errors: when the cause is removed, the error resets automatically to
resume operation. The code is displayed continuously and the exclamation
mark blinks.
• Displayed warnings (see 12.1.3)
Note
It is possible to view the error history of the water heater, refer to Error history (see
10.6).
12.1.1 General errors
Note
For the coding of the connections, refer to the Electrical wiring diagram.
Indication Cause Measure
Gas smell There is a gas leak - Close the mains gas valve at once.
- Do not operate any switches.
- Avoid open flames.
- Ventilate the boiler room.
- Immediately contact your installation
engineer or your local gas company.
The display is off There is no supply voltage. Make sure that:
- the isolator is in ON position.
- there is power on the isolator.
- there is power to the electrical
connector block.
The measured voltage must be
230 V
AC
(-15%, +10%).
Defective fuse(s) Replace the fuse(s).
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