9
F
A
UL
T FINDING CHAR
T P
ar
t 2
Does the orange
LED alight ?
Replace gas solenoïds
assembly
Replace electrod
assembly
Does the red LED
alight and 70/80 ?
Does the red LED
alight and 80 ?
Does the burner
alight more than 6 sec.?
Replace PCB
Replace PCB
Purge gas pipes and press on
reset button
Does safety gas
solenoïds energized ?
Is there a gas
pressure at manifold ?
check the ionization
electrod
Does DHW
temperature over 50
°C ?
Check DHW
thermistor
Does the heating
outlet pipe
temperature rise ?
Does heating LEDs
alight ?
Does the orange
LED alight ?
Replace DHW thermistor
The display fl
ashes on
40/50/60/80
Check or replace the 3 ways
valves
Replace PCB
Replace PCB
Stop to draw water at the tap
- Rotate counter to clockwise
DHW
potentiometer close
to the minimum.
- Adjust the DHW fl
ow rate at
3l/min on a tap.
- Wait until the temperature
becomes stable.
- Switch OFF the DHW mode,
- Rotate clockwise the heating
potentiometer
to maximum position,
- Press on RESET button to cancel all delays.
- Insure that external controls are calling for
heat.
Yes
The boiler is OK
No
Yes
Yes
Yes
No
No
No
Ok
No
No
No
Yes
Yes
No
No
No
No
Does the DHW
temperature rise ?
No
Yes
No
Ok
Replace the domestic hot
water heat exchanger or the
main exchanger
Yes
Yes
Yes
Yes
Check the wire or
replace overheat sensor
Replace PCB
Replace PCB
From the previous
page 8
Summary of Contents for Calydra Comfort 100 Nat
Page 48: ...110...
