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Indication Cause Measure
Water leakage There is a leakage from a threaded
water connection.
Tighten the threaded connection.
There is a condensate leakage Make sure that the condensation water
discharge is working properly.
If necessary, correct the water discharge.
There is a leakage from another nearby
water heater or pipe segment.
Trace the leakage.
There is a leakage from the water heater
tank.
Contact the supplier of your water heater.
Explosive ignition The gas supply pressure is incorrect. Check the gas supply pressure, refer to Gas
supply pressure (see section 8.9.3).
The CO
2
value is incorrect. Check the CO2 value, refer to CO
2
value
(see section 8.9.4).
The burner is contaminated. Clean the burner, refer to Gas-side
maintenance (see section 11.4).
There is an air leakage between the
venturi and the flexible air connector.
Make sure that:
the flexible air connector is not damaged.
If necessary, replace the flexible air
connector.
the flexible air connector is correctly
connected to the venturi.
If necessary, tighten the clamp.
Insufficient or no hot
water
The water heater is off. Turn on the water heater (see section 4.2).
There is no supply voltage. Make sure that:
the control switch is set to I.
the isolator is in ON position.
there is power on the isolator.
there is power to the electrical connector
block.
The measured voltage must be
230 V
AC
(-15%, +10%).
The hot water supply is used up. Reduce the hot water consumption. Wait
until the water heater heats up.
The controller is in the OFF mode. Set the controller in the ON mode (see
section 4.2.1).
The temperature (T
set
) is set too low. Set the temperature (T
set
) to a higher value
(see section 4.2.2).
72 Installation, Maintenance and Service part
72


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