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boiler service, boiler repair, emergency repair
Glowworm Ultracom 2 30sxi Boiler Fault Codes
| Code | Description | Cause | Solution |
| F00 | Flow heating temperature sensor fault | Sensor open circuit |
• Check the sensor’s connections. • Check the wiring harness. • Check the sensor. |
| F01 | Return heating temperature sensor fault | Return heating temperature sensor disconnected | See F00 Solutions |
| F10 | Flow heating temperature sensor fault | Sensor short-circuit | See F00 Solutions |
| F11 | Return heating temperature sensor fault | Return heating temperature sensor shorted. | See F00 Solutions |
| F20 | Overheating fault | Overheating safety device activated (97°C) |
Check the operation of the pump. • Check the wiring harness. • Check that the flow and return heating isolation valves are open. |
| F22 | Water pressure of the installation (<0.3 bar) | Return water valve closed Pump disconnected Leak in the installation |
Fill the installation. • Purge the installation. • Check the pump connections. • Check the flow and return heating sensor connections. • Check that there are no leaks. |
| F23 | Maximum temperature difference reached between return and flow heating | Water circulation fault |
• Check the flow and return heating sensor connection. • Check the pump speed. |
| F24 | Water circulation fault | Malfunction of the pump (excessively rapid temperature increase) | • Check that the flow and return heating isolation valves are open. |
| F26 | Fault in gas valve motor | Disconnected or defective cables |
• Check the gas valve connections. • Check the operation of the gas valve. • Check the operation of the condensate pump (option). |
| F27 | Flame detection fault | Abnormal flame detection |
• Check the flame detection electrode. • Check the main board. • Check the igniter unit. |
| F28 | Ignition fault |
No return gas / Insufficient gas flow Gas valve incorrectly adjusted Defective firing electrode and flame control / Defective igniter unit |
• Check the return gas circuit (gas valve open). • Check the observe the flame picture and check the CO2 setting. • Check the igniter unit connections. • Check the state of the electrode (corrosion). |
| F29 | Loss of flame during operation | See F28 | See F28 |
| F32 | Incorrect air pressure | Incorrect fan speed |
• Check the entire flue system. • Check the fan’s electrical connections. |
| F49 | EBUS voltage fault |
Fault in EBUS line Short circuit in EBUS connector |
Check that the eBus controls are fitted and wired correctly |
| F61 | Fault in the main board | Gas valve command fault |
• Check the main boards connections. • Check the main board. • Check the appliance DSN number is correct. • Reset the appliance. |
| F62 | Fault in the main board | Gas valve closure fault | SEE F61 |
| F63 | Fault in the main board | Fault in the main board memory | SEE F61 |
| F64 | Fault in the main board | Rapid fluctuation of return or flow heating sensor. | SEE F61 |
| F65 | Fault in the main board | Excessive main board temperature | SEE F61 |
| F67 | Fault in the main board | Flame signal fault in the main board | SEE F61 |
| F68 | Fluctuation of flame signal |
No return gas / Insufficient gas flow Gas valve incorrectly adjusted Defective firing electrode and flame control / Defective igniter unit |
Check the return gas circuit (gas valve open). • Check the observe the flame picture and check the CO2 setting. • Check the igniter unit connections. • Check the state of the electrode (corrosion). |
| F70 | User interface incompatible with the main board | Incorrect product code |
Check that the appliance DSN code on the screen matches the product code of the nameplate (in the event of a fault and the appliance DSN does not appear, consult menu.d.93 reserved for the code). • Check the boards reference. |
| F71 | Flow heating temperature sensor fault | Flow heating temperature sensor unclipped or defective (no temperature variation) |
Check the sensor connections. • Make sure that the sensor is clipped to the tube. |
| F72 | Permanent temperature difference between flow and return heating sensors | Mismatch between the flow and return heating temperatures (permanent difference) |
• Check temperature sensors connections. • Replace faulty sensors. |
| F73 | Heating circuit pressure sensor fault | The sensor is shorted or disconnected. |
• Check the sensor’s connections. • Check the sensor. |
| F74 | Heating circuit pressure sensor fault | Fault in pressure sensor | SEE F73 |
| F76 | Thermal fuse fault | Thermal fuse disconnected Defective thermal fuse |
• Check the fuses connections. • Replace the heat exchanger. |
| F77 | Fault in gas valve motor |
Defective gas valve. Defective condensate pump (option) |
• Check the gas valve connections. • Check the operation of the gas valve. • Check the operation of the condensate pump (option). |
| F83 | No water in the installation : the temperature does not increase when the burner is lit | Return water valve closed Pump disconnected Leak in the installation |
•Fill the installation. • Purge the installation. • Check the pump connections. • Check the flow and return heating sensor connections. • Check that there are no leaks. |
| F84 | Permanent temperature difference between flow and return heating sensors | Inverted or disconnected flow and return heating temperature sensors Defective temperature sensors |
• Check temperature sensors connections. • Replace faulty sensors. |
| F85 | Flow and return heating sensors fault | Flow and return heating temperature sensor connected to same tube | • Check temperature sensors connections. |
| F86 | Underfloor heating contact fault | Floor heating contact open Sensor disconnected or defective |
• Check the sensor connections. • Check that the sensor is connected to the main board and the shunt is removed. |
| Err | User interface fault | Defective user interface |
• Check connection from user interface PCB to main PCB. • Replace user interface. |