Technical data

SAVE A SERVICE CALL

DIAGNOSTIC FEATURES OF ELECTRONIC THERMOSTAT

This water heater incorporates an electronic thermostat. In the event of a fault occurring with the thermostat,

a 2-digit code will be displayed.

Code

Fault

Temperature sensor failure

If the fault code is displayed, phone Rheem Service or their nearest Accredited Service Agent to arrange for

an inspection.

BURNER WILL NOT LIGHT

Is the fan in the air duct (631 275 model only) operating continuously?

Ensure the front cover is securely in position. Switch off the electrical supply at the isolating switch, wait

30 seconds and then switch the electrical supply on again. Phone Rheem Service or their nearest

Accredited Service Agent to arrange for an inspection if the water heater burner fails to light.

Is there gas to the water heater?

Check the gas isolation valve on the gas supply line is open.

Is there a normal gas supply to the rest of the premises?

Try lighting another gas appliance. If there is no gas call your gas provider.

Is the ignition system ‘locked out’?

Try resetting the water heater. Refer to “Water Heater Not Operating” on page 14.

TEMPERATURE PRESSURE RELIEF VALVE RUNNING

Normal Operation

It is normal and desirable that this valve allows a small quantity of

water to escape during the heating cycle. However, if the discharge is

deemed excessive (more than 2% of hot water used), there may be

another problem.

Continuous dribble

Try gently raising the easing lever on the relief valve for a few seconds

(refer to “Temperature Pressure Relief Valve” on page 10). This may

dislodge a small particle of foreign matter and clear the fault. Release

the lever gently.

Steady flows for long period (often at night)

This may indicate the mains water pressure sometimes rises above

the designed pressure of the water heater. Ask your installing plumber

to fit a pressure limiting valve.

Warning: Never replace the relief valve with one of a higher

pressure rating.

Heavy flows of hot water until water heater is cold - then stops

until water reheats

The water heater must be switched off at the switchboard. Phone

Rheem Service or their nearest Accredited Service Agent to arrange

for an inspection.

EXPANSION CONTROL VALVE RUNNING

If an expansion control valve is fitted in the cold water line to the water heater (refer to page 26) it may

discharge a small quantity of water instead of the temperature pressure relief valve on the water heater. The

benefit is that energy is conserved as the discharged water is cooler.