Adm Troubleshooting Table - No Hot Water - A.O. Smith ADM - 40 Installation, User And Service Manual

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
Green LED OFF and No supply voltage
Red LED ON present
Green LED ON and Blockage in the flue gas
Red LED OFF discharge (the flue gas
thermostat has cut out)
Symptom Cause
Green LED ON and There are three possible causes for this error. In order to determine the cause, you must
Red LED ON 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.
SeeIsolating 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)
Instruction manual ADM
Precautions
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%).
1. Trace the blockage
2. Remove the blockage
3. Reset flue gas thermostat (7.7 "Flue gas thermostat reset
button").
Precautions
Comment
See the ADM electrical diagram (14 "Appendices")
If the error cannot be rectified, contact your installation engineer
When a demand is detected, the appliance will restart
Comment
If the error cannot be resolved or is persistent, contact your
installation engineer
is
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