Once the light stops blinking, the controller has saved the optimal PID settings. 6. Common Error Codes
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| Error Code | Common Issue | Recommended Action | | :--- | :--- | :--- | | | Failure to ignite | Try resetting the boiler by pressing the "R" button for at least 2 seconds. | | E02 | Overheating safety thermostat triggered | The primary circuit overheated. Press the "R" button for at least 2 seconds to reset after the system cools. | | E03 | Flue/draught sensor or pressostat problem | Check for a blocked flue. After clearing any obstruction, reset by holding the "R" button for at least 2 seconds. | | E04 | No flame after 6 consecutive attempts | Press the "R" button for at least 2 seconds to try a reset. | | E05/E06 | Temperature sensor defective | Call an authorized service center to replace the heating (E05) or DHW (E06) sensor. | | E10 | No signal from the hydraulic pressostat | Check the pressure gauge. The water pressure in the system might be too low. | | E25/E26 | No water circulation or pump blockage | Call a technician to inspect the pump and ensure there is no airlock in the system. | | E32 | Scale in the heat exchanger | The heat exchanger is likely clogged with rust or limescale, requiring a professional service. | | E35 | Flame error (parasitic flame) | A flame was detected when it shouldn't be. Press the "R" button for at least 2 seconds. | | E96/E97 | Voltage/frequency issue | The power supply is unstable. Check your home's electrical system. | fourtech temperature controller manual
Setting your target temperature is the most common adjustment you will make. Follow these steps for immediate operation:
Illuminate when the primary or secondary control outputs are actively firing. Once the light stops blinking, the controller has
Verify input terminals 1 and 2 with a multimeter for 85–265V AC.
Disclaimer: This article is a general informational guide. Always refer to the official FourTech temperature controller manual specific to your device for safety and precise instructions. I need to search for relevant information
| Symptom | Likely Fix | |---------|-------------| | Display shows --- or Err | Bad sensor connection or shorted probe | | Output relay clicks but no power | Load >10A; use external relay/contactor | | Temperature overshoots | Increase differential (CD/HD) or move probe closer to load | | Unit resets randomly | Undersized power supply or noise from compressor relay |