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The overheat prevention system has two phases. The overheat warning light is lit when
the temperature of the water being heated rises to 50 °C or the overheating sensor in the
heater detects a temperature higher than 75°C. The heater burner is switched off at the
same time.
Once the water temperature has exceeded 50°C, the overheat prevention system
deactivates the burner and turns on the warning light. As the temperature drops, the
system will reset automatically, enabling heater operation.
If the heater water exceeds 75°C, the overheat prevention system deactivates the
burner and activates the warning light. In this case, it must be determined whether the
overheating was caused by a failure in the heater or water circulation (e.g. pipe blockage).
1. Check fuel level and the fuel hose connections to detect leaks. Repair any faults
immediately.
2. Check the connections of the exhaust piping and their tightness. Remove soot and
other dirt with a soft cloth.
3. Check the water circuit hoses for leaks. Repair any faults immediately.
4. When you start the heater, monitor burner operation and smoke formation. If a
noticeable amount of black smoke is discharged from the exhaust pipe, the oil burner is
not operating correctly. Please contact a Rexener maintenance service to determine the
problem.
Maintenance should be done by guaranteed person reguarly.
Regularly wipe the surface and exhaust pipe of the water heater with a dry and clean
cloth. Mild cleaning agents may also be used where necessary.
DO NOT WASH the heater with a water jet or pressure washer. Water entering the heater
internals may cause malfunctions or electrical shocks.
If the flame detector’s sensor is covered in soot or other dirt, the heater power is reduced
and its operation can be prevented entirely. In order to prevent operating failures, the
flame detector must be checked regularly and cleaned as necessary.
•Detach the flame detector from the burner by pulling it outwards. The flame detector is
installed in the lower section of the burner.
•Clean the flame detector sensor with a soft and clean cloth.
•Reinstall the flame detector carefully. The protrusion (A) in the body of the detector
must settle firmly in place.
•If the flame detector is extremely sooty, the heater may also require sweeping.
DAILY INSPECTION POINTS
CLEANING AND MAINTENANCE
Resetting the overheat prevention system
Cleaning the rexener water heater
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