Installation and Operation manual ETHOS 36C and ETHOS 54C –1511/05-issue1
Page 14
5 OPERATION
5.1 Display
The display has two digits, which indicate the supply temperature of the central heating water in the boiler:
By pressing the Info button, the operating status can be displayed. If the Info button is pressed twice, the display will
show the water temperature of the central heating water. If the display shows a code that starts with a (t), the boiler
will temporarily shut down, except for code t4 and t5. If these are active, the boiler will run an emergency
programme. If a (t) condition is automatically restored, the boiler will operate normally again.
.0 Standby
.2 Fan start
.3 Fan pre-purge
.4 Ignition
.5 CH mode heat demand or CH pump overrun
.6 DHW operation
.7 DHW preheating or DHW pump overrun
t0 High limit thermostat >opened 30sec.
t1 Supply temperature too high during CH demand or anti-recycle timer
t2 Supply temperature too high during hot water mode
t3 Hot water temperature too high
t4 Supply sensor interrupted / short-circuited
t5 DHW sensor interrupted / short-circuited
t7 Room thermostat anti-recycle timer active
t8 Bleed programme active
t9 VKK check error None UK code
tc Temperature Delta-T during start too low
5.2 Diagnosis mode display
In this menu various current settings and the last 10 failures or interlocks can be consulted, without using a laptop.
If no failures are saved in the burner control unit memory, the display shows ’- -’.
By pressing the ’-’ button (approx. 1 sec.), the diagnostic menu is shown. By pressing the Info button, the following
information is shown:
D1 = current supply temperature
D2 = domestic hot water temperature
D3 = domestic cold water temperature
D4 = outside temperature
D5 = DHW flow litres/min
D6 = pump on 1 /pump off 0
D7 = three-way valve position C = CH / T = DHW
D8 = ionisation current (micro Amp)
D9 = not active
E0 = --last failure … E1--E9= other stored failures
5.2.1 Control buttons
These buttons give access to different options for adjusting and checking the appliance; by pressing a button or a
combination of buttons, the following functions can be performed:
1. Switching DHW production on or off
By pressing the ’+’ button (3 sec.), the DHW function can be activated.
H1/ - - alternately shown on display: DHW is switched off.
H1/ t a alternately shown on display: DHW is switched on.
By pressing the Info button again, a selection can be made between the Eco or Comfort mode for keeping the
internal DHW heat exchanger warm. The display alternately shows H2 / EC or H2 / CF.
H2 / EC, DHW heat exchanger temperature is not maintained hot, longer waiting time for hot water.
H2 / CF, DHW heat exchanger is maintained warm and tapping hot water is faster. Adapt this setting by using the ’+’
or ’-’ button. Press the Info button to save the modified setting.
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General