A flashing fault code is usually protection, not a failure. Which signs really mean the pump controller has failed, what causes leaks and a blank display, and how repair and warranty work.
When a pump controller shows a fault code and stops the pump, many people assume the unit itself has failed. In most cases it hasn't: the unit has seen a problem in the pump, the water or the pipework and has protected the pump. This guide separates the signs of a real failure from normal warnings.
What a flashing display means
When a fault occurs, the HYDROSET display shows the fault code flashing and the pump stops. Most of these codes are about the pump and the water, not the unit itself:
| Code | What it is about | Controller failure? |
|---|---|---|
| E1 | Pump current has exceeded F3 | No; the pump or the F3 setting |
| E2 | No current seen from the pump | No; the wiring, capacitor or pump thermal switch |
| E3 and E4 | Water isn't reaching the pump | No; water, air or settings |
| E6 | Pressure sensor | The sensor or its cable |
| E7 | Temperature sensor inside the unit | Yes |
| E8 | Temperature inside the unit is high | Usually not; ventilation |
The cause and fix for each code are in the list of fault codes.
Signs that really point to the unit
An E7 fault that keeps coming back. The temperature sensor inside the unit has failed. Clear the fault with the Cancel key; if it comes back, the unit needs repair. See the E7 page.
An E6 fault. The pressure sensor cable is broken or the sensor itself has failed. This part is replaced on its own, and there is no need to replace the whole unit. First look at the green light on the back of the sensor; if it is off, the sensor or its cable has failed.
An E5 fault. This code is printed on the unit's casing, but the current edition of the manual gives no cause or fix for it. Rather than guessing, contact support.
A blank display even though there is power. First check the miniature circuit breaker and the input wire connection. If power is reaching the input terminal and the display still doesn't come on, the unit needs to be checked.
The display pressure doesn't match the pressure gauge on the vessel. First check where the sensor is; it must be after the check valve, at a point where air doesn't collect. Parameter F14 is calibrated at the factory for each unit; if someone has changed it, the pressure is read wrongly.
What causes a controller to leak
No water passes through the unit itself; a leak almost always comes from where the pressure sensor is screwed in. The sensor thread is G1/4 female. Unscrew the sensor, re-seal the thread and screw it back in. The sensor cable is fixed, so before tightening, turn the sensor backwards a few turns so the cable doesn't twist.
If water has got inside the unit, disconnect it from the power. Water getting inside is one of the things that voids the warranty, so choose a mounting position where water can't fall on the unit.
Can a pump controller be repaired
Yes. HYDROSET has a two-year warranty: for any defect in parts or manufacture, the unit is repaired or replaced free of charge. After that it has five years of after-sales service covering parts, repair and technical support.
These void the warranty:
- The unit being opened or repaired outside an authorised dealer
- Physical damage, impact or water getting inside the unit
- Connection to a supply outside the 180 to 240 V range, or lightning damage
- A defaced serial number label on the unit
So don't open the unit yourself.
Before contacting support
Have these ready so the check goes faster:
- The code you saw on the display.
- The current on the pump nameplate.
- The values of F1, F2, F3 and F4.
- When the fault happens: at start-up, while running or after the water supply is cut.
If you use the pump controller settings app, the unit's operating status is recorded for technical support, and the specialist can see what happened.
