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A.O. Smith COF 455 Manual

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Figure 8: Resetting the overheating cut-out
Fault Possible cause Measure
Heater is off or Chimney is blocked. Trace (or let trace) cause and rectify it.
does not ignite
Overheating cut-out is activated. Let water in heater cool down and set the water
temperature to a lower value. Reset the overheating cut-out.
Let heater ignite.
Gas or oil supply shut off. Open gas or oil valve.
Insufficient hot Temperature set too low. Set water temperature to higher value.
water or none
at all Overheating cut-out is activated. Reset overheating cut-out after the water has cooled down
and set the water temperature to a lower value.
Supply of hot water exhausted. Reduce hot water use. Give the heater time to heat up the
water.
Cause cannot be traced. Remove voltage supply. Close gas / oil supply valve and
contact your installer.
Water leakage Insufficient sealing of the water Tighten the screw thread connections.
connections (screw thread).
Leakage from another water appliance Trace the cause.
or pipes in neighbourhood.
Please consult the front-mounted burner’s installation
manual in the event of faults in the front-mounted burner.
4. WHAT TO DO IN CASE OF FAILURE
4.1 General
If faults occur, check the following points:
• Overheat thermostat
The water heaters are equipped with an overheating
cut-out, which, in the case of a too high water
temperature, interrupts the current supply to
the burner, as a result of which the gas valves in the
gas block are closed and the gas supply is cut off.
The overheating cut-out remains activated until the
water temperature drops below the overheating
cut-out’s switching-off point. Then the water
heater can be turned on again by resetting
the overheating cut-out. Next set the control
thermostat to a lower water temperature,
(see figure 8).
• Water temperature too high:
Check if the control thermostat has been set too high.
• Wrong hot water temperature:
1. Check the control thermostat setting;
2. Check that there are no leaks or if any taps are
open.
4.2 Fault overview
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