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Heat Line
Fault Codes
Listed below are the common Heat Line fault codes as described by the boiler manufacturer along with a possible cause.
Heat Line Fault Codes
Table 1. Most common Heatline faults based on error code message
| Fault code | Description | Solution |
|---|---|---|
| F00 | Flow heating temperature sensor fault | Verify the sensor’s connections. Verify the wiring harness. Verify the sensor |
| F01 | Return heating temperature sensor fault | Verify the sensor’s connections. Verify the wiring harness. Verify the sensor |
| F10 | Flow heating temperature sensor fault | Verify the sensor’s connections. Verify the wiring harness. Verify the sensor |
| F11 | Return heating temperature sensor fault | Verify the sensor’s connections. Verify the wiring harness. Verify the sensor |
| F20 | Overheating fault | Verify the operation of the pump. Verify the wiring harness. Verify that the fl ow and return heating isolation valves are open |
| F22 | Water pressure of the installation | Fill the installation. Purge the installation. Verify the pump connections. Verify the flow and return heating sensor connections. Verify that there are no leaks |
| F23 | Maximum temperature difference reached between return and flow heating | Verify the flow and return heating sensor connection. Verify the pump speed |
| F24 | Water circulation fault | Verify that the fl ow and return heating isolation valves are open |
| F26 | Fault in gas valve motor | Verify the gas valve connections. Verify the operation of the gas valve. Verify the operation of the condensate pump |
| F27 | Flame detection fault | Verify the flame detection electrode. Verify the main board. Verify the igniter unit |
| F28 | Ignition fault | Verify the return gas circuit (gas valve open). Verify the observe the flame picture and Verify the CO setting. Verify the igniter unit connections. Verify the state of the electrode |
| F32 | Incorrect air pressure | Verify the entire flue system. Verify the fan’s electrical connections |
| F49 | EBUS voltage fault | Verify that the eBus controls are fitted and wired correctly |
| F61-67 | Fault in the main board | Verify the main boards connections. Verify the main board. Verify the appliance DSN number is correct. Reset the appliance |
| F68 | Fluctuation of flame signal | Verify the return gas circuit (gas valve open). Verify the observe the flame picture and Verify the CO setting. Verify the igniter unit connections. Verify the state of the electrode . |
| F70 | User interface incompatible with the main board | Verify that the appliance DSN code on the screen matches the product code of the nameplate. Verify the boards reference |
| F71 | Flow heating temperature sensor fault | Verify the sensor connections. Make sure that the sensor is clipped to the tube |
| F72 | Permanent temperature difference between flow and return heating sensors | Verify temperature sensors connections. Replace faulty sensors |
| F73-74 | Heating circuit pressure sensor fault | Verify the sensor’s connections. Verify the sensor |
| F76 | Thermal fuse fault | Verify the fuses connections. Replace the heat exchanger |
| F77 | Fault in gas valve motor | Verify the gas valve connections. Verify the operation of the gas valve. Verify the operation of the condensate pump |
| F83 | No water in the installation: the temperature doesn’t increase when the burner is lit | Fill the installation. Purge the installation. Verify the pump connections. Verify the fl ow and return heating sensor connections. Verify that there are no leaks |
| F84 | Permanent temperature difference between flow and return heating sensors | Verify temperature sensors connections. Replace faulty sensors |
| F85 | Flow and return heating sensors fault | Verify temperature sensors connections |
| F86 | Underfloor heating contact fault | Verify the sensor connections. Verify that the sensor is connected to the main board and the shunt is removed |
| Err | User interface fault | Verify connection from user interface PCB to main PCB. Replace user interface |
Table 2 Central heating and hot water functionality fault finding
| Fault | Action | Solution |
|---|---|---|
| No hot water | Is the central heating? Yes | Replace flow meter or/and D.H.W. sensor |
| No hot water | Is bar LED illuminating? Yes | Re-pressurize system |
| No central heating | Is there overheat LED illuminating? Yes | Replace overheat thermostats |
| No central heating | Is pump running? No | Check wiring / connections mains voltage |
| No hot water and no central heating | Open a hot tap to create a demand – is there a spark at the ignition electrode? Yes | Replace gas supply, pressure or gas valve |
| No hot water and no central heating | Open a hot tap to create a demand – is there a spark at the ignition electrode? No. Is fan running? Yes | Replace air pressure switch or overheat sensor |
| No hot water and no central heating | Are LEDs on? No | Replace user interface PCB |
| No hot water and no central heating | Is fan running? No | Replace low water pressure switch |
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