9
OPERATING CODES/TROUBLESHOOTING
60
CODES
DESCRIPTION
TRIP CONDITIONS
RESET METHOD
E 128
FLAME CONTROLLER ON AND
ARRESTED
The flame controller is arrested (E_12) but the gas
solenoid valve is excited. In this case the flame
controller is de-excited.
Reset via DDC (or via the controller, menu 2, parameter 20). If the
code persists, contact authorised TAC.
u 129
GAS SOLENOID VALVE WITHOUT
ELECTRICAL POWER
Gas solenoid valve is off for 5 seconds (with flame
controller on).
Automatic, when at least of the following conditions obtains (and
only if the "E 101" condition has not been forced): flame controller
off, or solenoid valve excited.
E 129
GAS SOLENOID VALVE WITHOUT
ELECTRICAL POWER
The gas solenoid valve has been off for more
than 10 minutes (with the flame controller on),
or "E 101" is keeping the flame controller on. Or
also in the case that, with the flame off (but flame
controller on) "E 101" obtains when generation of
"u/E" is enabled.
Reset via the controller, menu 2, parameter 21 (or via DDC). If the
code persists, contact authorised TAC.
E 135
DELIVERY WATER TEMPERA-
TURE PROBE FAULT (MACHINE
CIRCUIT)
The delivery water probe on the internal circuit
(machine circuit) is faulty.
Contact authorised Technical Assistance.
u 136
MODULATING BLOWER FAULT
The blower speed is out of range.
Reset occurs automatically 20 minutes after the operating code is
generated.
E 136
MODULATING BLOWER FAULT
u_36 code generated three times in 1 hour of
operation.
Contact authorised Technical Assistance.
u 175
SYSTEM CIRCUIT WATER PRES-
SURE SWITCH - Insufficient
water flow
The system circuit water circulator is on and the
system circuit water differential pressure switch
is open.
Automatico ed avviene se il circolatore si spegne, oppure se il pres-
sostato differenziale si chiude.
E 175
SYSTEM CIRCUIT WATER PRES-
SURE SWITCH - Insufficient
water flow
Event u_175 has been generated 5 times since
the appliance was powered up, or code u_175 has
been active for 1 hour.
Carry out appropriate checks. Reset via the controller, menu 2,
parameter 21 (or via DDC). If the code persists, contact authorised
TAC.
E 176
OUTPUT WATER (SYSTEM) TEM-
PERATURE PROBE FAULT
Fault (interruption or short circuit) on outlet
system water temperature sensor.
Reset via the controller, menu 2, parameter 21 (or via DDC). If the
code persists, contact authorised TAC.
E 177
INPUT WATER (SYSTEM) TEM-
PERATURE PROBE FAULT
Fault (interruption or short circuit) on inlet system
water temperature sensor.
Reset via the controller, menu 2, parameter 21 (or via DDC). If the
code persists, contact authorised TAC.
u 178
DELIVERY WATER TEMPERATURE
(MACHINE CIRCUIT) HIGH
The water temperature on the internal circuit
(machine circuit) is too high.
Automatic (on termination of originating event).
u 179
DEFROST FUNCTION ACTIVATED
The temperature of the water has reached values
which could result in icing. In such cases, to pre-
vent the appliance arresting, the defrost function
may activate only the system circuit circulator or
also the flame controller.
The defrost function is de-activated automatically when the flame
controller switches off and/or the circulator switches off. These
switch off when the water temperature has reached the values
required to ensure operation of he appliance. The defrost function
can also be de-activated manually via the controller, menu 4,
parameter 163.
u 80
INCOMPLETE PARAMETERS
Incomplete functional parameters (menus 3, 4
and 5).
The code persists until operating parameters are entered and
completed. Contact authorised TAC.
E 80
INVALID PARAMETERS
Invalid parameters (menu 6) or damage to param-
eter memory.
Reset occurs automatically when correct parameters are entered.
If the code persists, contact authorised TAC: if the memory is dam-
aged, the controller must be replaced.
u 81; u 82
"BANK 1" AND "BANK 2" PARAM-
ETERS: INVALID
Bank 1 data invalid - Bank 2 data invalid: in both
cases, one of the two parameter memory pages
contains invalid values.
Automatic (on termination of originating event).
E 81; E 82
"BANK 1" AND "BANK 2" PARAM-
ETERS: INVALID
Bank 1 data invalid - Bank 2 data invalid: the pro-
gram has failed to copy the data from the correct
page to the other page.
Contact authorised Technical Assistance.
E 84
FAULTY TRANSFORMER CON-
NECTION OR 24 V AC FUSES
Danneggiamento dei 2 fusibili di ingresso 24-
0-24 Vac oppure interruzione del filo centrale
dell’alimentazione 24-0-24 Vac verso la scheda
Check fuses and 24-0-24 V AC electrical power connections on the
controller. Reset via the controller, menu 2, parameter 21 (or via
DDC). If the code persists or returns, contact authorised TAC.
E 85
INCORRECT MODULE TYPES
(from menu 6)
The set module type (from menu 6) does not cor-
respond to the one managed by the controller.
Contact authorised Technical Assistance.
E 86; E 87; E 88
; E 89
MEMORY TEST UNSUCCESSFUL
Processor error.
Contact authorised Technical Assistance.
E 90
AMBIENT TEMPERATURE SEN-
SOR DEFECTIVE
Interruption or short circuit of ambient tempera-
ture sensor.
Contact authorised Technical Assistance.
E 91
CONTROLLER DEFECTIVE
Numero seriale di scheda assente e/o codice di
versione hardware assente e/o chiave di criptazi-
one assente o errata; oppure i dati di calibrazione
sono assenti o inconsistenti.
Contact authorised Technical Assistance.
