Central Heating Mode - Glow-worm Ultracom 24cxi Installation And Servicing

State list - Accessed through Diagnostic Codes - Level 1, Installer Access d.99

Central heating mode

S.00 no heating required
S.01 fan pre-run
S.02 pump pre-run
S.03 ignition
S.04 burner on
S.05 pump / fan overrun
S.06 fan overrun
S.07 pump overrun
S.08 Anti cycling period
Domestic hot water mode
S.10 domestic hot water demand
S.11 fan pre-run
S.13 ignition
S.14 burner on
S.15 pump / fan overrun
S.16 fan overrun
S.17 pump overrun
Preheat mode
S.20 domestic hot water cycling mode active
S.21 fan pre-run
S.22 Pump pre run
S.23 ignition
S.24 burner on
S.25 pump / fan overrun
S.26 fan overrun
S.27 pump overrun
S.28 Anticycling period
Special cases of status messages
S.30 No Heating demand from external controls 230V
S.31 summer mode
S.32 Antifreeze active – fan speed variation too high
– waiting during blocking function
S.34 frost protection active (Priority 4)
S.36 No Heating demand from external controls 24V
S.42 Accesory Module is blocking burner operation
S.53 waiting time: temperature difference flow
- return sensor too high (Check thermistor fit)
S.54 waiting time: no water in system, temperature
(gradient error) rise flow / return sensor too high
S.76 Waiting period – pressure sensor
S.96 Return-Sensor check is running, demand
(DHW or heating) is blocked
S.97 Water pressure sensor check is running,
demand (DHW or heating) is blocked
S.98 Flow / Return - sensor check is running, demand
(DHW or heating) is blocked
14 Fault Finding
STATE LISTS
Check wiring in external controller.
Check wiring at Installer Interface.
Check CH setpoint / Check external controls
Check fan connection.
Temperature below 8
connection if this is not true.
Check wiring in external controller.
Check wiring at Installer Interface.
Check accessory module.
Check flow & return thermistor connections to pipes.
Check harness connection to thermistor.
Check harness wires are not trapped between any
internal components.
Check flow & return thermistor connections to pipes.
Check harness connection to thermistor.
Check harness wires are not trapped between any
internal components.
Check system pressure - default display.
Check return thermistor connection to pipe.
Check harness connection to thermistor.
Check connection to pressure sensor.
Check pump has not seized.
Check flow & return thermistor connections to pipes.
Check harness connection to thermistor.
Check harness wires are not trapped between any
internal components.
Description
NORMAL OPERATING
STATE FOR CH MODE
NORMAL OPERATING
STATE FOR DHW MODE
NORMAL OPERATING
STATE FOR PRE-HEAT MODE
O C - check thermistor
Diagram 14.8
53