To Next PageTo Next PageHow to fix Hnt high temp cut out on Stuart Turner Mainboost MJ3 VM?
If your Stuart Turner Water Pump experiences a high temperature cut out (Hnt), it means the pump head is overheating. The head temperature has exceeded the set Hnt value. To resolve this: * Allow the pump to cool down. * Ensure the pump inlet check valve and bypass are clear of any debris.
What to do if my Stuart Turner Water Pump shows 'Prt pump run time' error?
If your Stuart Turner Water Pump displays a 'Prt pump run time' error, investigate the cause. Then, turn the power off and on to reset the system. If the problem continues, contact Stuart Turner for further assistance.
What to do if my Stuart Turner Mainboost MJ3 VM shows Hpr Hi pressure cut out?
If your Stuart Turner Water Pump experiences a high-pressure cut-out (Hpr), investigate the cause. Then, turn the power off and on to reset the system, or allow it to self-reset.
What to do if my Stuart Turner Mainboost MJ3 VM shows Lpr Low pressure cut out?
If your Stuart Turner Water Pump experiences a low-pressure cut-out (Lpr), investigate the cause. Then, turn the power off and on to reset the system, or allow it to self-reset.
What does PF1 mean on my Stuart Turner Water Pump?
If your Stuart Turner Water Pump displays 'PF1', it indicates a pump failure. Contact Stuart Turner for assistance.
General| Brand | Stuart Turner |
|---|---|
| Model | Mainboost MJ3 VM |
| Category | Water Pump |
| Language | English |
Details registered trademarks and trade names for the Mainsboost system.
Explains the operational principles and unique bypass feature of the Mainsboost Charger MJ3.
Ensures proper pump priming and shaft seal protection before initial operation.
Specifies the acceptable minimum and maximum water temperatures for unit operation.
Provides guidance on secure pipework, soldering, and minimizing air locks for optimal performance.
Outlines compliance requirements with current water and building regulations.
Emphasizes correct vessel installation to prevent damage to pumps and controls.
Defines the components and installation of upstream line-in kits for different system sizes.
Clarifies the terms 'Upstream' and 'Downstream' in the context of the water system.
Illustrates Mainsboost Charger MJ3 installation in a typical house for single occupancy.
Describes the system setup for buildings with multiple apartments or units.
Details using multiple vessels in parallel for properties with significantly higher water demand.
Recommends a specific product for achieving high pressure at the drinking tap.
Instructions for handling and connecting the vessel for vertical installations.
Guidance on assembling the pump manifold for vertical variants.
Details on positioning the vessel assembly and installing the upstream line-in kit for vertical setups.
Instructions for handling and placing the vessel on mounting cradles for horizontal installations.
Guidance on positioning the vessel assembly for horizontal installations and connecting the line-in kit.
Information on optional covers to reduce noise levels in sensitive areas.
Mandates electrical installation adherence to local regulations by a qualified person.
Recommends RCD installation and power isolation before electrical work.
Ensures the appliance is earthed via the supply cord connected to the terminal box.
Details permanent connection to mains supply via a dedicated fused spur.
Provides colour-coding guidance for connecting wires to terminals.
Illustrates the electrical connections for the pump and controller unit.
Specifies fuse rating and procedures for replacing the supply cord.
Ensures power is off before checking stopcock and system for leaks.
Details the importance and method for setting vessel pre-charge pressure.
Outlines how to check and record the static mains water pressure.
Explains factory presets and steps to adjust pump parameters via the control module.
Step-by-step guide for completing the installation and initial system operation.
Covers warranty, approvals, and noise levels for the MJ3 VM and MJ3 HM models.
Details mounting, pump type, flexible hoses, and dry run protection.
Specifies materials used for pump body, impeller, and mechanical seal.
Lists maximum head, working pressure, ambient, and operating temperatures.
Describes pump connections and flexible hose specifications.
Covers power supply, consumption, fuse rating, and cable length.
Provides dimensions, enclosure protection, and weight details.
Presents overall system dimensions for various models and noise reduction options.
Describes alarm functions, messages, and initial actions for faults.
Lists specific fault codes and their corresponding actions or resolutions.
