7
EN
Rev. 00 - 11/2018
LEB - TS
1.5 Faults remedy
1 The heating unit operates improperly when the following fault codes are displayed intermittently on the LCD screen. “A”
means faults resulted from blockages and requires manual intervention; “F” represents automatically remedied faults. The
fault codes disappear automatically after the remedy of the faults.
Fault Code Fault description Type
A01 Electric leakages Blockage
A03 Temperature limiter (decoupled mechanic temperature limiter) Blockage
A06 Temperature in the heating unit above 90°C Blockage
A08
Heating sensor or domestic hot water sensor disconnected from the ow pipe (normally, after a
5-minute heating order, the temperature increases on the ow pipe sensor and on the domestic
hot water sensor do not exceed 3°C. No temperatures above 40°C are detected).
Blockage
F10 Faulted heating temperature sensor (faulted NTC sensor, short circuited cables, unconnected
cables, or interrupted cables).
Reset after fault remedy
F13 Outdoor temperature sensor faulted (faulted NTC sensor,
short circuited cables, unconnected cables, or interrupted cables).
Reset after fault remedy
F14 Faulty temperature sensor for the water inside the domestic hot water (DHW) tank (faulted NTC
sensor, short-circuited cables, unconnected cables, or interrupted cables).
Reset after fault remedy
F37 The water pressure inside the installation is not correct
(pressure too low, water pressure switch not connected or defective)
Reset after fault remedy
F41
System out of operation (in case of a temperature gradient higher than the reference value).
Make sure that there is circulation in the heat exchanger; check the open position of the valves,
check the circulating pump operation). In such a case, the fault can be automatically remedied
after the temperature gradient become ≤5°C.
Reset after fault remedy
1.6 Functions
A: Hour and heating program intervals setting:
During normal operation, keep the heating activation program key pressed for 3 seconds in order to activate the hour setting,
starting with the setting of the hour. Turn the heating button to change the parameters. Shortly press the set key once to store the
hour setting data and continue with the minutes setting. Turn the heating button to change the parameters. Shortly press the set
key once to store the minutes setting data. If the heating unit is in the summer mode, you can activate the setting of the heating
program intervals. Turn the heating button through the points of the heating program intervals. Shortly press once the set key to
activate/deactivate the selected point of the heating program interval. After nishing the setting, press the OK key to exit and store
the performed changes. If you do not want to store the performed changes, shortly press the reset key to exit the menu.
B: Domestic hot water (DHW) tank key use:
The DHW tank key can be used if the tank is connected (P05 from the menu is set in the Stopped mode). If the DHW tank is not
allocated for other purposes, the key has no function.
C: Temperature setting and control:
1. Heating temperature set interval: 30-80°C The temperature drop that lets the boiler restart after shut off when the supply be-
came higher than the set point: 5-20°C
2. Temperature set interval inside the DHW tank 30- 60°C. The temperature drop that lets the boiler restart after shut off when the
supply became higher than the set point : 5-20°C.
3. Heating temperature to start: Tw<Ts-ΔT
*Note: Tw=working temperature; Ts=set temperature; ΔT=The temperature drop that lets the boiler restart after shut off
when the supply became higher than the set point.
D: Frost protection function:
Class I frost protection: for temperatures 8°C, the water pump keeps operating until heating temperature reaches ≥ 10°C, and
in such conditions the frost protection function becomes active and the FD message is displayed on the screen, while the anti-
freeze function is active, when the unit is in the OFF mode.
Class II frost protection: for temperatures 5°C, the water pump is activated and the resistances coupled to start heating. The re-
sistances are decoupled in the case of temperatures ≥30 °C, and the pump will keep operating for a short period of time. During
the unit’s frost protection function activation, the screen displays the temperature, if the unit is in the OFF mode.
E: Outdoor temperature compensation
Follow the operation 1.7 and enter PO7 menu, choose a curve by the heated rotary knob. When set the curve, it shows C (C--,
C01-C10) in the rst digit. C-- means close the outdoor temperature compensation function. The boiler will operate automatically
according to the target temperature which set by the users with the rotary knob. C01-C10 means to adjust the target water tem-
perature by the means of curve 1 to 10.
