The Hub screen is off
Is the screen in sleep mode?
By default the Hub 2 screen is set to turn off after 30 seconds of inactivity, this serves purpose for two reasons, one is that it is energy saving, and the second is we want to make sure every ounce of the radio signal is available so we reduce any interference from the screen by turning it off, there is no setting that allows the screen to remain on, but the timeout setting can be changed to as much as 30 minutes. To do this simply touch the settings cog, then display settings, and slide the slider to the desired setting.
A Hub I screen does not turn off by default but can be set to sleep after a certain amount of time. To check this, touch the screen and see if the display comes on. If it does not, remove the top unit and check for mains power by checking the mains power LED.
Is there power to the unit?
There are two ways to check this:
- The first is to make sure any isolation switches are switched on, eg a switched fused spur installed that inadvertently turns off the Guru Hub (We say that the hub should always be on unless isolated for maintenance).
- The second is to remove the top unit carefully and check for a mains power light on the PCB of the base unit. If the red LED is not on, then there is no power. If the mains supply is on, then there could be a problem with the base unit itself. We recommend a qualified electrician measure the voltage across the mains terminals.
To do this, the mains voltage cover needs to be removed and then use a multimeter across the live and neutral terminals on the left-hand side. There should be circa 240v present. If the voltage is present then the base unit will need to be swapped out. If there is no voltage then the problem lies before the hub itself.
This task should only be carried out by a qualified electrician.
Is the ribbon cable inserted correctly?
Between the top unit and the base unit, there is a ribbon cable. This needs to be securely inserted into both parts of the hub. To check this remove the top unit carefully by removing the screw underneath the fascia, then slide the top unit upwards and pull towards you. Lift the screen up and check that both ends of the cable are inserted fully. If they are then there is a problem with the top unit and it will need to be replaced with a new one and recommissioned.
No meter data is being collected
Has the hub been commissioned correctly to the meter?
In order to check that the meter has been commissioned to the HES correctly, you will need to log into the commissioning app and navigate to the account settings.
If there is no meter mbus address in the mbus address field then you will have to add the address in the format of mbus/XX (where xx is the secondary address of the heat meter.)
If you encounter an error when adding the mbus address, please check the following:
- Make sure there is continuity between the heat meter and the hub mbus cable. For example, there have been cases when the cable has had screws driven through it.
- Ensure that the mbus cable has been terminated into terminals 1 and 2 on the guru base unit on the right-hand side.
- Ensure that the mbus cable has been terminated into the correct terminals on the heat meter. Mbus protocol normally conforms to terminal numbers 24 & 25
- Ensure that the meter is an mbus meter and there are no special functions required to bring it out of a sleep state.
- Make sure the baud rate selected on the hub is compatible with the heat meter. Normally 2400 is required.
- If there is more than one mbus meter connected to the hub, then make sure they support the same baud rate as one another, two different baud rates can’t exist on one mbus master.
- If there is more than one mbus meter connected to the hub, make sure they are on independent mbus addresses. If there is an mbus conflict, you will be able to tell because, in the scan for mbus section on the commissioning app, you will see a number inside triangle brackets like <XX>
- Has the meter been approved for use with the Guru Hub 2? You can obtain this information from Appendix 2.
- Is the meter mains powered? If so has it been wired into the mains?
- If you are seeing multiple mbus addresses but only expecting one address, then you might be connected to a sitewide mbus network. (Please disconnect the mbus cable from the hub as a site-wide network also feeds 36v over the mbus cables
- Is there 36v over the two mbus terminals, if not then there could be a problem with the circuit board. This could be either the top unit or the base unit.
- To check this, use a multimeter and measure the voltage over terminals 1 & 2.
- If there is no voltage, then please try a new top unit and return the old unit to Guru.
- If there is still no voltage then swap the base unit and return the faulty unit to Guru.
No power to the unit.
Sometimes you might see that there is no power to the hub. This can be before the top unit is fitted. To identify if there is no power to the unit then please check if there is a red LED light in the base unit. If there isn’t the please carry out the following checks.
- Check there are no isolation switches that are switched off.
- Check voltage over the mains power terminals located under the mains cover plate.
This should be carried out by a qualified electrician
DO NOT ASSUME THERE IS NO POWER IF THE LED IS UNLIT
- If there is no voltage then the supply to the Hub needs to be checked.
- If there is voltage but the top unit is not powering up or there is no LED present then please send the base unit back to Guru and install a new base unit.
- If the new base unit has power and the LED is lit then please change the top unit and return the top unit to Guru.
The valve is not operating when the relay is controlled.
In some cases you may find that a control valve is not opening or closing, this can be a number of factors:
- The valve may not be wired to the base unit. Check for continuity between the relay and the control valve.
This is mains voltage, please turn off the hub before you test this.
- The valve may be wired incorrectly to the base unit.
If this is the potential cause, then a qualified electrician should check to make sure the valve requirements have been met by the Hubs supply.
- The relay may be faulty, although this has never happened.
- The valve may be faulty
Please have an electrician investigate this.