Gauge blank, frozen or showing the wrong level
Work out whether it's the gauge, the controller, a sensor or connectivity.
Start by identifying the controller version, because faults show up differently on each.
SAFETY
Only carry out electrical or unvented hot water checks if you are competent to do so. Isolate the supply and prove it dead before you remove covers or touch wiring, and never ask a homeowner or resident to access live components.
Follow these checks in order
1. Identify the controller version
- Plastic cover: 1.0 controller.
- Metal cover: 2.0 controller.
2. Check the controller LED
- If the LED is off, suspect a power, fuse or wiring fault. The gauge may look dead.
- If the LED looks abnormal, suspect a controller fault. The gauge may be unreliable. Contact Mixergy support with the MX number.
- If the LED is normal, go to step 3.
3. Check the gauge display
- Blank: suspect the ribbon cable or gauge PCB, or no power to the gauge. Contact Mixergy support with the MX number.
- Frozen: suspect a sensor bus fault, with the controller not updating the level. Contact Mixergy support with the MX number.
- Shows a level: go to step 4.
4. Compare the gauge with the app
- If the app is correct but the gauge isn't, suspect the gauge, gauge PCB or ribbon cable. Contact Mixergy support with the MX number.
- If both the app and the gauge are wrong, go to step 5.
5. Check the blue LED on the gauge
- If the blue LED is on, the gauge is receiving data, so suspect the internal level sensor or the controller. Contact Mixergy support with the MX number.
- If it's off, it's a connectivity issue rather than a level sensor fault. See Cylinder offline or not connecting.
Differences between controller versions
1.0 controller (plastic cover)
- LED off usually means power or a fuse.
- Gauge faults are often the ribbon cable or gauge PCB.
- A power cycle often clears a frozen gauge.
- Firmware updates can make the gauge look faulty for a short time.
2.0 controller (metal cover)
- LED off more likely means a board failure.
- Gauge faults are often the sensor bus or an internal sensor.
- A power cycle rarely clears bus faults.
- Wrong readings are usually the sensor or controller, not the gauge.