68
CODES
DESCRIPTION
TRIP CONDITIONS
RESET METHOD
E 444
EVAPORATOR TEMPERATURE
SENSOR FAULT
Evaporator temperature probe fault
Reset may be performed from the CCI/DDC (or from the S61 board
via menu 2, parameter 21). If the code persists, contact authorised
Potterton TAC.
u 446
HOT INLET WATER TEMPERATURE
TOO HIGH
Hot inlet water temperature higher than upper
operating limit of the appliance (if the appliance
is in operation).
Resets automatically if, with the circulator on, the cause resolves or
(with circulator off ) 20 minutes after generation of code.
u 447
LOW HOT WATER TEMPERATURE
Hot water temperature lower than lower
operating limit of the appliance (if the appliance
is in operation).
Reset occurs automatically when cause resolves or 430 seconds
after the code is generated.
E 447
LOW HOT WATER TEMPERATURE
u_47 code generated 3 times in 1 hour of
operation of the circulator.
Reset occurs automatically when the condition that generated the
code ceases. If the code persists, contact authorised Potterton TAC.
u 448
HOT WATER DIFFERENTIAL
TEMPERATURE TOO HIGH
High hot water diff erential temperature.
Reset occurs automatically 20 minutes after the operating code is
generated.
E 448
HOT WATER DIFFERENTIAL
TEMPERATURE TOO HIGH
u_48 code generated twice in 2 hours of
operation.
Reset may be performed from the CCI/DDC (or from the S61 board
via menu 2, parameter 21).
E 449
SATELLITE BOARD NOT PRESENT
Satellite board not present.
Reset occurs automatically when the condition that generated the
code ceases.
u 452
DEFROSTING FUNCTION ACTIVATED
Defrosting function activated. Defrosting is
activated if at least 90 minutes has passed since
the last defrosting (or 180 minutes if temperature
is inferior of -5°C), if the fl ame control unit has
been on for at least 15 minutes, and if room
temperature, temperature of hot inlet water and
of the evaporator require its execution.
The Code clears automatically when execution of defrosting ends.
u 453
WATER FLOW IN HOT PASSIVE
MODULE
Warning is generated if system operating in
conditioning mode and the fl owmeter of the hot
module is closed.
Reset is automatic and occurs when the condition that generated
it ceases to apply.
u 478
OUTLET HOT WATER TEMPERATURE
TOO HIGH
Outlet hot water temperature too high
Reset is automatic and occurs when the condition that generated
it ceases to apply.
u 479
DEFROST FUNCTION ACTIVATED -
HOT SIDE
Activation takes place only if the
hot module is off and the antifreeze
function is enabled (see menu 1,
parameter 163).
Antifreeze function activated (with function
enabled: see menu 1, item163; and only with
machine off ). In this case the antifreeze function
activates the plant water circulator. If this
temperature falls further to below 3 °C, the
function also activates the fl ame controller.
Resets automatically (defrost function disabled) if, with only the
circulator operating, the hot water inlet/outlet temperature rises
above 5°C (at which point the circulator switches off ); or, if also the
fl ame controller is on, when the temperature reaches 18 °C (in this
case the fl ame controller and then the circulator switch off ).
u 480
INCOMPLETE PARAMETERS
Incomplete parameters.
The code remains until operating parameters are entered and
completed. Contact authorised Potterton TAC. If the board is
replaced, Code E_80 may appear; this means that the unit’s
characterisation parameters have not been set.
E 80/480
INVALID PARAMETERS
Invalid parameters or damage to parameter
memory.
Reset occurs automatically when correct parameters are entered.
If the code persists, contact authorised Potterton TAC: if the
parameters are incorrect, it is necessary to enter and complete the
unit operating and characterisation parameters; if the memory is
damaged, the controller must be replaced.
u 481
INVALID BANK 1 PARAMETERS
Invalid Bank 1 data - Bank 2 data OK.
Reset occurs automatically 5 seconds after the code is generated.
E 481
INVALID BANK 1 PARAMETERS
The program attempts to resolve the problem by
writing the second page over the fi rst; if after 5
attempts this fails, the error is generated.
Reset may be performed from the CCI/DDC (or from the S61 board
via menu 2, parameter 21). If the code persists, contact authorised
Potterton TAC.
u 482
INVALID BANK 2 PARAMETERS
Invalid Bank 2 data - Bank 1 data OK.
Reset occurs automatically 5 seconds after the code is generated.
E 482
INVALID BANK 2 PARAMETERS
The program attempts to resolve the problem by
writing the fi rst page over the second; if after 5
attempts this fails, the error is generated.
Reset may be performed from the CCI/DDC (or from the S61 board
via menu 2, parameter 21). If the code persists, contact authorised
Potterton TAC.
E 484
FAULTY TRANSFORMER
CONNECTION OR 24 V AC FUSES
Damage to one of the 2 24-0-24 V AC transformer
fuses, or one of 24-0-24 V AC wires to the board
not supplying current.
Check fuses and 24-0-24 V AC electrical power connections on the
controller. Reset may be performed from the CCI/DDC (or from the
S61 board via menu 2, parameter 21). If the code persists or occurs
again, contact authorised Potterton TAC.
E 485
INCORRECT MODULE TYPES (from
menu 6)
The set module type (from menu 6) does not
correspond to the one managed by the controller.
Reset occurs automatically when correct parameters are entered. If
the code persists, contact authorised Potterton TAC.
E 486
MEMORY TEST UNSUCCESSFUL
Processor error.
Contact authorised Potterton TAC.
E 487
MEMORY TEST UNSUCCESSFUL
Processor error.
Contact authorised Potterton TAC.
E 488
MEMORY TEST UNSUCCESSFUL
Processor error.
Contact authorised Potterton TAC.
E 489
MEMORY TEST UNSUCCESSFUL
Processor error.
Contact authorised Potterton TAC.
E 490
AMBIENT TEMPERATURE SENSOR
DEFECTIVE
Interruption or short circuit of ambient
temperature sensor.
Reset may be performed from the CCI/DDC (or from the S61 board
via menu 2, parameter 1). If the code persists or occurs again,
contact authorised Potterton TAC.
E 491
CONTROLLER DEFECTIVE
One of the following is absent: serial number of
board, hardware version code or encryption key
written during board test.
Contact authorised Potterton TAC.
8.2
SAFETY DEVICES
The PED (Pressurised Equipment Directive) prescribes that the unit is supplied with a hermetic
circuit safety valve (pos. B in the Figure 8.1 units major safety devices on page 69).
