When your Fagor boiler starts acting up, the first thing that might come to mind is worry about the repair cost or even the possibility of having to replace it. However, before you panic, it’s important to understand that many times, the problems we face with these devices can be identified and solved relatively easily thanks to the error codes they display.
Error codes are basically messages that your boiler generates to tell you what’s failing within its system. Think of them as a secret language between your boiler and you, where each code has a specific meaning. Although it might seem complicated to decipher these messages at first, with the right guide, you’ll be able to understand what’s happening and how to act.
In this article, we present a complete table of the most common error codes for Fagor boilers, along with their description and possible solutions. This information will help you quickly identify the problem and, in many cases, solve it on your own without needing to call a technician.
Remember, however, that if you’re not comfortable performing any of the suggested solutions or if the problem persists after trying to solve it, it’s important to contact a professional. Handling your boiler without proper knowledge can be dangerous.
Error Code Table
| Error | Description | Cause | Solution |
|---|---|---|---|
| F1 | Lockout due to ignition failure | Possible causes: Valve-chamber connection, Incorrect adjustment, Dirty burner, Defective gas valve, Non-corresponding, defective or blocked injectors, Safety thermostat tripping in some boilers, Water pressure switch opening in some bi-thermal boilers, Lack of gas, Poor spark jump, Chamber tightness, Very low start, Poor gas/air mix, Incorrect gas inlet pressure, Presence of air in the gas circuit, Defective ionization plug | |
| F10 | When turning off the burner, it attempts to extinguish the flame by alternately closing the all-or-nothing solenoid valves. If the flame does not disappear in less than 5 seconds during a shutdown, closing the other solenoid valve and checking that it extinguishes the flame. The next shutdown will start again with the solenoid valve that did not work, if it does not close again, the boiler locks. It is a fault in one of the card relays: stuck relay contacts or breakage of the actuation coils. | Possible causes: Circuit failure, Ionization plug, Gas valve failure, Spark transformer | |
| F2 | Upon ignition, it checks that the air pressure switch is deactivated. If it is not open after 15 seconds, the boiler locks | Possible causes: Damaged fan, Excessive flue length, Defective air pressure switch, Communicated flue tubes, Obstruction in the air inlet or flue outlet, + – connection of the pressure switch reversed | |
| F3 | If the heating circuit pressure is below 0.6 Bar or above 2.8 Bar with the pump stopped or 3.2 Bar with the pump running, the boiler locks (service request is not necessary) | Adjust heating circuit pressure | |
| F4 | Cut-off due to opening of the safety thermostat (102ºC) | In bi-thermal boilers, opening of the water pressure switch. And in atmospheric boilers, opening of the TTB (83ºC). | |
| F5 | If there is any failure in the software protections of the control program, the boiler locks | It is an internal fault of the electronic circuit. It unlocks by entering the self-test | |
| F6 | If a flame is detected in the off regime for 10 seconds, the boiler locks. Keeps the fan and pump running | Possible causes: Flame detector failure, Ignition for unknown reasons, The flame does not extinguish when closing the gas valves | |
| F7 | If the primary circuit outlet temperature exceeds 105º C, the boiler locks. Keeps the pump running until the temperature drops to 85º C. F7 can only occur with the burner running or a few seconds after turning off (approximately 6 seconds) | Possible causes: Thermistor failure, Bleeding does not work, Misadjusted regulation (minimum too high) | |
| F9 | It is important to understand that this failure will not appear as such on the Command Holder. The problem is that, as it does not appear as a fault on the command holder, it is difficult to detect. Therefore, a brief description of its behavior is made | The existence of a flame is checked at the same time as the functionality of the system based on the primary circuit outlet temperature. If a malfunction is detected (a temperature of the primary circuit thermistor less than 50ºC, and a power greater than 95% for more than 5 minutes) a shutdown and start-up sequence of the boiler is performed |
Our advice
Before attempting any repairs on your own, make sure to carefully read the description and suggested solutions for each error code. If the problem seems complex or if you’re unsure how to proceed, it’s always better to consult a professional. Remember, safety comes first.
Error codes in Fagor boiler
Troubleshoot error code “F9” in Fagor boiler
Troubleshoot error code “F7” in Fagor boiler
