Manual A.O. Smith EQ 155 (page 22 of 32) (English)

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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.

2.10.3 Hot 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.

2.10.4 Hot water temperature too

high

Check whether the control thermostat is

set too high.

2.10.5 Possible 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.

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A.O. Smith EQ 155 Manual

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