Dražice OKCE 50 - Most Frequent Function Failures and Their Causes

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We recommend checking and cleaning the tank from scale and eventual replacement
of the anode rod after two years of operation. The anode life is theoretically calculated
for two years of operation; however, it changes with water hardness and chemical
composition in the place of use.
Based on such an inspection, the next term of anode rod
exchange may be determined.
If the anode is only blocked with sediments clean its surface
and, if used up, mount a new one.
Have a company in charge of service affairs deal with the
cleaning and exchanging of the anode. When draining water from the heater, the combination
faucet valve for hot water must be open, preventing occurrence of under-pressure in the
heater tank which would stop water from draining.
2.9 MOST FREQUENT FUNCTION FAILURES AND THEIR CAUSES
FAILURE SYMPTOM
INDICATOR
SOLUTION
Water is cold
• Light on
• The temperature set on the
thermostat is too low;
heating element failure
Water is cold
• Light off
• No supply voltage!
• Thermostat failure
• Safety thermostat shut off
probably due to failed
operation thermostat
Water is not warm
enough
• Light on
• Failure of one of the coils in
the element (2x 1100W)
Temperature of water is
not corresponding with
the temperature set on
the control
• Defective thermostat
Water is constantly
dripping off the safety
valve
• Light off
• high input pressure
• defective safety valve
Table 5
Do not attempt to repair the failure yourselves. Seek either expert or service help. It does not
take much for an expert to remove the defect. When making a repair appointment, report the
type and serial number you find on the performance plate of your water heater.