Normal operation
Installation, use and maintenance manual – G gas unit heater
35
6
Table 6.4
Operating parameters
Parameter
Description
Features
Default
PM 01
Operating mode
01 - standard
02 - function not applicable
03 - ventilation priority (only without
chronothermostat)
01
PM 02
Ventilation speed in ventilation priority mode (only without
chronothermostat)
1. low speed
2. average-low speed
3. average-high speed
4. high speed
4
PM 03
Lower modulation depth limit in standard mode.
Indicates the lower modulation value of the gas unit heater
thermal power (0% corresponds to the minimum power output):
e.g.: setting 10% the gas unit heater will modulate from 100%
(maximum heat output) to 10% of the modulation range (1).
From 0 to 100%
0%
PM 04
Do not modify
76%
PM 05
Upper modulation depth limit in standard mode.
Indicates the upper modulation value of the heat output (100%
corresponds to the maximum heat output) of the gas unit heater.
From 0 to 100%
100%
PM 06
Chronothermostat presence
1: with chronothermostat
0: without chronothermostat
1
(1) To understand the meaning of heat output or modulation percentage, refer to the specific clarification note in Paragraph 6.3.9
6.3.11
Fault signals
Any faults that may occur during normal operation of the
gas unit heater can be identified by means of an error
code on the chronothermostat display.
Table 6.5
p. 35 shows the descriptions of the faults re-
ported by the chronothermostat, the causes that deter-
mine them and the intervention modes.
Table 6.5
Operating faults shown on the chronothermostat
Error code
Fault description
Causes
What to do
01 E (1)
Flame lock-out due to failure to ignite the
burner
The ignition electrodes are broken or badly
positioned
Check the position or replace electrodes
The flame sensor is broken or incorrectly
positioned or touches the appliance metal
structure
Check the position or replace the electrode
Failure of the electronic board or its electri-
cal connections
Check the electrical connection of the
board and replace it if necessary
Failure of the gas valve or its electrical
connections
Check the electrical connection of the gas
valve and replace it if necessary
Ineffective earthing system
Make improvements to the earthing
system
Air in the gas pipes or no gas supply
Purge the air from the gas pipe
After having identified and resolved the
cause of the fault, press the
key of
the chronothermostat to reset the error
02 E (1)
Limit thermostat trip due to overheating of
heat exchangers
Dirt accumulation at the air intake
After having identified and resolved the
cause of the fault, reset the limit ther-
mostat by pressing the
key of the
chronothermostat to reset the error
Obstruction of the delivery outlet
Fan failure
Sudden power failure of the gas unit
heater during its operation
Flame fault
Flue gas recirculation in the combustion
air duct
Correct the position of the exhaust and
intake air terminals or replace them if they
are not suitable for use
Flame sensor fault
Replace the flame sensor electrode
Main electronic board fault
Replace main electronic board
03 E
Heat exchanger temperature probe fault
Delivery air temperature probe fault
The error message is automatically reset
once the triggering fault has been resolved
06 E
Flue probe enable cable interrupted on
electronic board
False contact on flue probe enable
Restore the contact
07 E
Failed or incorrect blower operation
Unstable electrical connections
The error message is automatically reset
once the triggering fault has been resolved
08 E
Blower motor failure
09 E
Insufficient blower rotation
Check the electrical connection of the
blower and replace it if necessary
