A.O. Smith ADM - 80 - Manual (Page 58)

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Instruction manual ADM 58
Symptom Cause Precautions Comment
(a)
three unsuccessful
start attempts in a row
1. No gas:
- Check that the gas valve is open
- Check whether the gas control is opening (clicking of the
gas control)
- Check the leads of the gas control
2. No ignition:
- Check whether the hot surface igniter lights up
- Check the electrical supply to the hot surface igniter.
- Check the leads of the glow igniter
3. No flame detection:
- Check that the Phase (L) and Neutral (N) are correctly
connected (from the mains) to the appliance
- Check whether the flame probe is defective
- Check that the flame probe leads are properly connected
If the error cannot be resolved or is persistent, contact your
installation engineer
Symptom Cause Precautions Comment
(b)
The safety thermostat
has cut out
1. The safety thermostat has cut out correctly:
- Reset the appliance
- Check whether the control thermostat is working
- Check whether the high-limit thermostat is working
- Check that the circulation pump (if present) is working
2. The safety thermostat has cut out without apparent reason:
- Check whether the thermostat is defective
- Check whether the sensor of the thermostat is defective
If the error cannot be resolved or is persistent, contact your
installation engineer