General Test And Fault Finding - Ferroli MODENA 80 E Installation, Servicing And User Instructions Manual

8.10 General test and fault fi nding
Check electrical supply - C.H. water pressure and frost protection
Chek the following carefully before starting
• Gas supply is turned on, is adequate and purged
• Electricity supply is turned on
• Polarity is correct
• CH pressure is set between 1 - 1,5 bar
• CH pump spins freely
YES
Water pressure
YES
is not set
between
1 - 1,5 bar?
NO
Set pressure to
Check water
pressure
switch wiring
connection
Check and if
necessary
replace water
pressure switch
YES
Go to CHART 2
D.H.W. taps closed
CH Selector to
Summer " " position
Put main switch to on
Is LED5 on?
YES
Is LED5 flashing?
NO
1 - 1,5 bar
Does fan run at full speed?
YES
Does CH Pump run?
YES
If the boiler temperature
is less than 5°C
frost protection is activated
Disconnect
CH flowtemp sensor
Has fan speed stopped?
NO
Check and if necessary
replace main board
Chart 1
Is 230V present across
NO
terminals X1-1 X1-2?
Check and if necessary
replace 2A fuse
Is LED5 ON now?
NO
Go to CHART 2
NO
Is Relay RY101 switch on?
NO
YES
Repair external
wiring fault
NO
YES
Replace
main board
YES
Check pump
NO
connection
Check and if
necessary
replace pump
wiring