8
F
A
UL
T FINDING CHAR
T P
ar
t 1
PLEASE CHECK CAREFULLY FOLLOWING POINTS BEFORE
GOING THROUGH THE FAULT FINDING CHART
-Gas pressure
-Electric mains
-Minimal water pressure in the heating circuit (over 0.8 bar)
- All isolating valves opened
- Boiler air vented
-Minimal domestic hot water fl
ow of 2 l/min at 0.5 bar
-Check that the heating fi
lter is cleaned.
- Put all buttons on OFF position (turn them anticlockwise)
Put the main switch on 1
Does the green LED
alight ?
Replace the PCB
Replace the PCB
Replace the DHW
fl
ow switch
Release pump rotor
Does the red LED
alight ?
Does the fan run ?
Check if there is
voltage at the fan
Press on reset button to make
a new self test and reset
Does the pump run ?
Check the DHW
fl
ow switch
Check voltage in the
pump electrical box
Check that the
pump spins free
Check heating
fl
ow switch
Replace PCB
Replace spark generator or
ignition electrods assembly
Could you ear the
spark generation?
Does the spark gen
-
erator energize
Check contact of
air pressure switch
between P and 2
The display fl
ashes on 40/60/80
The fan stops after 45s
- Check pressure probes or
- Check Flue duct condition or
- Replace pressure switch
Yes
Yes
Yes
No
No
Ok
Ok
No
The display fl
ashes on 60/70/80.
Replace heating fl
ow switch, or
Check the plates exchanger
(Scaled)
T
he display fl
ashes on
50/70/80 or 50/60.
Replace the heating thermistor
The display fl
ashes on
40/60/70.
Replace the air pressure switch.
No
Replace the PCB or the wiring
Replace the fan
Check heating fl
ow
switch
Check contact of air
pressure switch between P
and 1
Check if there is voltage
at between connectors P
and 1
No
Check the heating
thermistor
No
No
No
Yes
Yes
No
No
Ok
Ok
Ok
Ok
Ok
Ok
Draw of Domestic Hot Water
with a fl
ow of 3 l/min,
Switch the Domestic Hot water
mode on and turn
DHW on
Please refer to the error list
and solve the problem
No
- Check mains inlet
connection
- Check internal fuses
- Check main switch on PCB
The display fl
ashes on 50.
Replace the heating fl
ow
switch
means a test or a choice
means an action
means a group of actions
Does the display
Flashe?
Ok
No
No
Replace pump
Please go to
the next page
No
Anytime the display can show an error code,
Please try to solve the problem and then press
Reset to make a new self test and start the boiler again
Yes
Ok
Yes
Yes
No
No
Summary of Contents for Calydra Comfort 100 Nat
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