A.O. Smith ADM - 80 - Manual (Page 57)

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Instruction manual ADM 57
11.4 ADM Troubleshooting table - no hot water
Warning
Maintenance may only be performed by a qualified service and maintenance engineer.
No hot water
Symptom Cause Precautions Comment
Green LED OFF and
Red LED ON
No supply voltage
present
1. Check if the isolator is ON.
2. Check whether there is power to the isolator
3. Check whether there is power to the electrical connector block
4. Check whether there is power to the burner control
5. Check fuse in the burner control
The measured voltage must be 230 VAC (-15%, +10%).
See the ADM electrical diagram (14 "Appendices")
If the error cannot be rectified, contact your installation engineer
Green LED ON and
Red LED OFF
Blockage in the flue gas
discharge (the flue gas
thermostat has cut out)
1. Trace the blockage
2. Remove the blockage
3. Reset flue gas thermostat
(7.7 "Flue gas thermostat reset
button") .
When a demand is detected, the appliance will restart
Symptom Cause Precautions Comment
Green LED ON and
Red LED ON
There are three possible causes for this error. In order to determine the cause, you must
cause the error to appear again:
1. Reset the appliance by pressing the reset button 1x
2. If nothing happens, then the reset button has been pressed too often (maximum 5 times
in a single heating cycle). Disconnect the appliance from the mains and then restart it.
See
Isolating the appliance from the mains and steps 3 through 5 of Starting the
appliance .
3. Decide which type of cause (a) or (b) describes the situation. (see tables below)
If the error cannot be resolved or is persistent, contact your
installation engineer