Jet MAXI D125 - User Manual

Questions and Answers

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Jennifer ParkSep 3, 2025
What does HIGH H20 fault mean on my Jet MAXI D125 Heating System?
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  Daniel ThomasSep 3, 2025
  If the HIGH H20 fault is displayed on your Jet Heating System, it could be caused by: * A non-standard electrical connection has been made into terminals 21 & 22. Remove all non-standard electrical connections. * The digital controller has failed. Replace digital controller.
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robertscottSep 18, 2025
What does SERVICE displayed on the screen mean for my Jet MAXI D125 Heating System?
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  Stephen PerrySep 18, 2025
  If SERVICE is displayed on the screen of your Jet Heating System, the unit is due an annual service. Contact service engineer.
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akennedySep 16, 2025
Why don't the buttons on the digital controller respond on my Jet MAXI D125?
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  Kelly MorenoSep 16, 2025
  If the buttons on the digital controller of your Jet Heating System aren't responding, the plastic housing of the digital controller may have come apart and the PCB has moved. Reassemble the digital controller housing and ensure that the PCB is properly seated.
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John KellySep 14, 2025
Why are the digital controller parameters being corrupted on my Jet MAXI D125?
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  morenorandySep 14, 2025
  If the digital controller parameters on your Jet Heating System are being corrupted, the controller might be subject to power spikes. Fit a suitable power filter to resolve this.
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Bailey BishopSep 12, 2025
What to do if P2 FAIL is displayed on a single pump Jet MAXI D125?
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  Catherine FlowersSep 12, 2025
  If P2 FAIL is displayed on your Jet Heating System, but it's a single pump model, the PUMPS NUMBER option is likely incorrectly set to 2. Change the PUMPS NUMBER setting to 1.
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James MurphySep 12, 2025
Why does the pump persistently become air-locked in my Jet MAXI D125 Heating System?
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  John CarrilloSep 12, 2025
  If the pump in your Jet Heating System keeps becoming air-locked, it could be because the wrong or no flow restrictor is installed in the float valve (mini and midi units only). Check float valve flow restrictor selection (mini and midi units only).
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ryanhudsonSep 9, 2025
What should I do if the pump runs but doesn't make up pressure in my Jet MAXI D125?
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  turnerrussellSep 9, 2025
  If the pump runs but doesn't build pressure in your Jet Heating System, it's likely that the pump is air-locked and not pumping water. Bleed the pump to resolve this.
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robin82Sep 7, 2025
Why doesn't the digital controller power up on my Jet MAXI D125?
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  kedwardsSep 7, 2025
  If the digital controller on your Jet Heating System isn't powering up when you switch on the unit, check these: * The fuse has blown. Replace the fuse. * The mains power supply is at an incorrect voltage or frequency. Check mains power supply. * The 12V transformer has failed. Replace Transformer. * The digital controller has failed. Replace digital controller.
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Kimberly LopezSep 5, 2025
What does P1 and/or P2 FAIL mean on my Jet MAXI D125?
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  Douglas ClaytonSep 5, 2025
  If P1 and/or P2 FAIL is displayed on your Jet Heating System, it might be because: * The PUMP TYPE option is set incorrectly. Review PUMP TYPE setting. * The relevant pump has failed. Replace pump.
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Alexander MunozAug 20, 2025
What to do if the LOW PRESSURE fault is displayed and the pumps do not run on my Jet Heating System?
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  Jeffrey PriceAug 20, 2025
  If the LOW PRESSURE fault is showing and the pumps aren't running on your Jet Heating System, here's what might be happening: * The internal isolation valve within the unit could be closed. If so, open the internal isolation valve. * The system pressure might have dropped below the LOW PRESSURE set point. To fix this, increase system pressure using a filling loop, or enable the SYSTEM FILL option. * The SPC CONTROLLER option might be enabled. Try disabling the SPC CONTROLLER option. * The LOW PRESSURE set point might be too high. In this case, review the system specifications.