A.O. Smith EQB 115 G, EQB 200 G manual Fault finding, Gas smell, Condensation, Important warning

2.10 Fault finding

In case of failure the following should be checked.

2.10.1 Safety thermostat

All appliances have been fitted with a safety thermostat that shuts off the gas supply when the water temperature is too high. The safety thermostat remains activated until the water temperature drops below the safety temperature. The water heater must be reignited manually. The regulation thermostat should be set to a lower water temperature. If the pilot is extinguished repeatedly at higher temperatures than normal, this indicates that the safety thermostat is operating.

2.10.2 Flue down draught safety device

If the flue tube safety device has switched off the appliance, the appliance can be put back into operation through the normal procedure. If the flue tube safety device repeatedly puts the appliance out of operation then this points to problems with the flue. The only remedy is to determine the cause of the problem (for instance a blocked chimney) and to solve the problem.

2.10.3Hot water temperature too low

1.Check the setting of the temperature control knob.

2.Check whether the pilot is alight. If necessary ignite (see “Putting into operation”).

3.Check whether there are any leaks or open taps.

4.Is the gas supply adequate? Check and correct if necessary.

5.Perhaps the hot water consumption is higher than was originally calculated.

6.Check whether the cold water inlet has been correctly connected.

7.Check the thermostat sensor for scale build up.

2.10.4Hot water temperature too high

Check whether the control thermostat is set too high.

2.10.5Possible water leakage

1.Check whether the drain tap is fully closed.

2.Check whether all water connections are water tight.

3.Check whether the possible water leakage could be caused by condensation.

2.11 Gas smell

Warning

Immediately shut the main gas tap. Do not light any fire or switch on any lights, do not use any electrical switches or alarm bells. Open windows. Thoroughly inspect all gas connections and, if the gas smell persists, alert the local gas company and/or your installer.

2.12 Condensation

If the appliance is filled with cold water or if the hot water consumption is very high, condensation of flue gasses will occur on the cold surfaces of the combustion chamber and the flue tube. The water drops will fall on the burner and cause a sizzling noise. This is a normal phenomenon that will disappear as soon as the appliance reaches its normal operating temperature.

Important warning

The applicance should NEVER be taken into operation with a closed cold water supply!

Provision should always be made for expansion.

21