EHC FUSION COMET 12 kW, Installation & Technical Manual, Page: 15 / 16

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GB-031C_f.625
FaulT FInDInG
symptom Reason Procedure
The indicators and LCD display
on the front panel are off
No power to the boiler Check electricity mains power supply
Main over heat stat cut-out
Check the temperature safety cut-out investigate cause
- possibly fault / return sensors or power board
The „A” indicator flickering
Insufficient water pressure Check water pressure in display panel and increase to 1.5 bar
Pressure Sensor failure
Check water pressure in display panel and if display shows
„- -” then replace Pressure Sensor
The „H” indicator flickering
Pump is blocked
Free Pump by setting the Pump on the highest gearing – See
Figure 3 then unscrew the screw on the Pump housing –
See Figure 2. Move Pump rotor manually.
Water is not circulating through the
Boiler
Vent the system: Radiators, Pump and Boiler
Pump not running
Check power available at Pump head, if power available
replace as necessary. If power not available check fuse on
Controller Module and replace if necessary
Flow sensor not operating Check the flow sensor and replace as necessary
„G” indicator is flashing but
boiler digital display operating
„NA” connection open circuit
Ensure „NA” connection is closed or if using external con-
trol (e.g. Shower Sensor) that this is working correctly
„G” indicator flashing „NA” connection open circuit Check „NA” connection - should be closed
„K” indicator flickers Failure of inlet temp sensor Replace inlet temp sensor
„L” indicator flickers Failure of outlet temp sensor Replace outlet temp sensor
„G” „H” & „K” Indicators lit but
boiler not heating
No supply to heating coils from
Power Board.
Check outputs „G1” „G2” & „G3” on Power Board if
230Volts not present to all replace Power Board
„G” „H” & „K” Indicators lit but
boiler only partially heating
One or more heating coils have no
voltage supply from Power Board
Check outputs „G1” „G2” & „G3” on Power Board if
230Volts not present to all replace Power Board
TEChnICal sPECIFICaTIOns
Boiler range
Fusion Comet 6kW
(EHCCOM6KW)
Fusion Comet 9kW
(EHCCOM9KW)
Fusion Comet 12kW
(EHCCOM12KW)
Fusion Comet
14.4kW
(EHCCOM15KW)
Fusion Comet 24kW
(EHCCOM24KW)
Pipe entry from boilers Bottom Bottom Bottom Bottom Bottom
Central heating flow & return pipes 22 mm
Min water pressure 1 bar
Max water pressure 3 bar
Expansion vessel
6 lt.
Maximum system water volume about 60 litres at initial system pressure 1,5 bar
Vessel charge pressure 1,5 bar
Safety Class IP22
Dry weight 25kg
Electrical supply 230V 1ph 50Hz 415V 3ph 50Hz
Load/current 26,0 Amp. 39,1 Amp. 52,2 Amp. 62,6 Amp. 3 x 34,8 Amp.
Minimum permitted cable diameter 6mm 10mm 16mm 10mm
Heating output 20484Btu 30726 Btu 40968 Btu 49161 Btu 81936 Btu
Temp setting (factory set) 85°C
Min temp setting 20 - 40°C
Overheat Protection 100°C
Pump included Yes
Recommended Pump settings Set to max
Protection 32 Amp. 50 Amp. 63 Amp. 80 Amp. 3 x 40 Amp.
The maximum allowed network impedance 0,39 Ω 0,32 Ω 0,24 Ω 0,22 Ω