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Indication
Water leakage
Explosive ignition
Insufficient or no hot
water
70
Cause
There is a leakage from a threaded
water connection.
There is a condensate leakage
There is a leakage from another nearby
water heater or pipe segment.
There is a leakage from the water heater
tank.
The gas supply pressure is incorrect.
The CO
value is incorrect.
2
The burner is contaminated.
There is an air leakage between the
venturi and the air connector.
The air inlet filter is contaminated.
The water heater is off.
There is no supply voltage.
The hot water supply is used up.
The controller is in the OFF mode.
The setpoint is set too low.
The external ON mode switch is not
enabled.
Measure
Tighten the threaded connection.
Make sure that the condensation water
discharge is working properly.
If necessary, correct the water discharge.
Trace the leakage.
Contact the supplier of your water heater.
Check the gas supply pressure, refer to Gas
supply pressure (see 8.9.3).
Check the CO
value, refer to CO
2
(see 8.9.4).
Clean the burner, refer to Gas-side
maintenance (see 11.4).
Make sure that:
-
the air connector is not damaged.
If necessary, replace the air connector.
-
the air connector is correctly
connected to the venturi.
If necessary, tighten the clamp.
Clean the air inlet filter (see 11.4.3).
Turn on the water heater (see 4.1).
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
(-15%, +10%).
AC
Reduce the hot water consumption. Wait
until the water heater heats up.
Set the controller in the ON mode.
Set the setpoint to a higher value.
Set the "External use Enabled" to Yes. (see
10.5.1)
Installation, Maintenance and Service part
value
2
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