If the incorrect time is showing then this can be changed by pressing/holding the left hand side (+) and (–) buttons simultaneously for 3 seconds.
You will be asked to set the DATE, MONTH, YEAR and TIME. Use the (+) and (–) buttons to initially change the date. Press the central (:t:) button to confirm at each step.

(For TIME:O:STAT 2.0 and 3 purchased before 2022 the clock set is accessed through a pin hole on the LEFT side of the TIME:O:STAT)

The main clock is displayed in the top centre of the screen. Ensure the correct 24hr time is showing and the date is correct. This is required for the TIME:O:STAT to automatically adjust for BST.

For units after 2022 the reset is done by pressing and holding the right hand side (+) and (-) buttons simultaneously for around 3 seconds.

(For TIME:O:STAT 2.0 and 3 purchased before 2022 the reset is accessed through a pin hole on the RIGHT side of the TIME:O:STAT)

After changing advanced settings or RF channel the TIME:O:STAT will need to be RESET

No communication between wireless master & receiver due to low radio frequency is shown by 'Low Signal' being displayed on the screen and a flashing red LED on the black receiver box?

• Check the orientation of the receiver (how it is mounted on the wall). The internal aerial in the black receiver works best then mounted vertically in the suggested landscape orientation. Laying flat or in a portrait position will drastically reduce the communication range.
• Check the green light is showing on the TIME:O:STAT receiver by the boiler. If the green light is not showing there is no power. Have a qualified electrician check the wiring to the boiler.
• Check for low battery symbol showing on the TIME:O:STAT. If present replace the existing batteries with new high performance AA batteries.
• Check signal strength – follow the wireless signal strength testing procedure and Wireless TIME:O:STAT location guide.
• Check the communication channel, TIME:O:STATs are factory paired and do not require pairing. Changing the RF channel is only required if there are more than one TIME:O:STAT in close proximity. However the settings may have been inadvertently changed. You can check that the master and receiver IDs are the same – look through the aperture on the back of both the receiver and the master and ensure the 5 bitswitch settings are the same. If changing the RF channel you must always RESET the unit by holding the right side (+) and (-) buttons simultaneously for 3 seconds.
• Check the range - The controller and its receiver may be too far apart or there are solid walls in-between the units. Relocate the wireless TIME:O:STAT closer to the receiver minimising metallic and solid objects in its line of sight. (follow the Wireless TIME:O:STAT location guide)

DO NOT BEND THE BATTERY TERMINALS
• Try to wake the TIME:O:STAT, by adding time to the countdown, by pressing the top left (+) button
• Factory reset the unit by removing the batteries, then press a few buttons to clear any charge from the memory, wait for 60 seconds, then replace the batteries.
• Repeat the above procedure with new AA high performance batteries. Then RESET the unit by pressing/holding the right hand side (+) and (-) temperature buttons simultaneously for 3 seconds as the settings have been changed.

DO NOT BEND THE BATTERY TERMINALS
• Remove the batteries, then press a few buttons to clear any charge from the memory, wait for 30 seconds. Then replace the batteries with new AA high performance batteries.
• Low battery levels may be insufficient for radio frequency signal to operate correctly

Is the heating running when the TIME:O:STAT does not have an active heating demand (the radiator icon is off)?
• RESET the unit by holding the right hand side red + and blue - temperature buttons for 3 seconds. This may have not been done following an advanced settings change.
• Check hot water usage is not being called for that would result in the boiler running.
• Check RF interference from another TIME:O:STAT. - If there is another TIME:O:STAT in close proximity then each TIME:O:STAT should be set to a different RF channel and then reset following the change.
• TIME:O:STATs are factory paired and do not require pairing. Changing the RF channel is only required if there are more than one TIME:O:STAT in close proximity.
• Is the wiring correct? – this should be checked by a qualified person
• Check mains voltage has not passed through the low voltage contacts which may have damaged the unit during installation. (Maximum switchable current is 2A).

Is the heating off when the TIME:O:STAT has an active heating demand (the radiator icon is on)?
• Check the boiler master thermostat is not too low. If too low then the boiler will shut off the heating regardless of the temperature selected on the TIME:O:STAT.
• Check the heating is set to 'constantly on' on the boiler. If the heating is selected as off or on a separate timer then the TIME:O:STAT will not operate during the other timers ‘off’ periods.
• Is the wiring incorrect? - this should be checked by a qualified person - Check mains voltage has not passed through the low voltage contacts which may have damaged the unit during installation. (Maximum switchable current is 2A).

The two auto-program times displayed at the top of the
screen run according to the main clock in the top center of
the screen.
• Ensure this is showing the correct 24hr time.
• If the incorrect time is showing then this can be changed
by pressing/holding the left hand side (+) and (–) buttons
for 3 seconds

A desirable signal strength is at least 2 bars. Below this indicates a poor signal strength. When connected there will be a small network icon displayed in the bottom right of the screen and the signal strength bars will disappear.

1. Perform a RESET by holding the RIGHT side (+) and (-) buttons simultaneously for 3 seconds.
2. This will show the advanced settings info screen and RF signal strength meter. It shows the current signal strength in bars at the bottom of the display.
3. The signal strength indicator is dynamic, so you can move the unit around to find a location with stronger signal strength.
4. To exit this mode and return to normal operation press the (:t:) button.

Normally the radio frequency (RF) channel used for the communications between the TIME:O:STAT controller and receiver does not need to be changed. However you may be operating two TIME:O:STATs in close proximity. This could be due to TIME:O:STATs in adjacent properties or multiple boilers/zones within a property.

To change the channel:
1. Turn off the power to the boiler.
2. Remove the both the Time:o:stat controller and receiver from the wall brackets.
3. Adjust bitswitch settings 1.2.3.4 viewed through the aperture on the back of the receiver with a pin.
4. Adjust bitswitch in the same aperture on the TIME:O:STAT master to match. (leave switch 5).
5. Following any setting change you will need to RESET the control unit by holding the RIGHT side (+) and (-) buttons for 3 seconds. The info screen and signal strength meter will then display, press the (:t:) button to finish.

TIME:O:STAT changed from using 10 bitswitchs to an onscreen system in 2022. The TIME:O:STAT is shipped with the default advanced settings and locking bitswitch disabled. It is recommended that the locking bitswitch is enabled following changes to the advanced settings. This prevents tenants tampering with the advanced settings.

To adjust the advanced settings:
1. Press and hold the left side black (+) button and the red right side (+) button and the (:t:) button for around 3 seconds.
2. Setup 1 screen (For selecting countdown duration) will then be displayed (see the screen below)
3. In the top right of the screen the advanced setting option being selected is displayed. (in this case 2hr countdown). To change the advanced setting, cycle the options using the (+) and (–) buttons. To move to the next setup screen, press the (:t:) button below the screen.
4. The final INFO screen displays a summary of the selected advanced settings, which is also the RF signal test screen for wireless models. The optimal position for the best signal strength can then be selected for wireless models.
5. The advanced settings can be LOCKED to prevent tampering by switching bitswitch 1 to the up ‘on’ position. To do this first remove the front lower cover secured with the hex screw. Bitswitch 1 is located to the right of the T button. This will prevent changing the advanced settings until bitswitch 1 is returned to the down ‘off’ position. (Ensure mains power to the TIME:O:STAT is isolated whenever changing the any bitswitches with the wired mains model)

Selecting minimum 23 degree, comfort mode or any advanced settings have had no effect.

• After changing advanced settings the TIME:O:STAT will need to be RESET.
• For TIME:O:STATs purchased after 2022 this done by pressing and holding the right hand side + and - buttons for around 3 seconds.
• For TIME:O:STATs purchased before 2022 this is accessed through a pin hole on the RIGHT side of the TIME:O:STAT.

The TIME:O:STAT has been mistakenly placed in factory pairing mode

• Remove batteries
• Put the 8 dip switch down to (off)
• Replace batteries after 60 seconds to allow RESET
• TIME:O:STATs are factory paired and do not require pairing. Changing the RF channel is only required if there are more than one TIME:O:STAT in close proximity.

No communication between wireless master and receiver due to poor radio frequency

• Ensure the power pack is plugged in, turned on and connected to the receiver next to the boiler.
• Check the range- The controller and its receiver may be too far apart or there are solid walls in-between the units.
• Relocate the wireless TIME:O:STAT closer to the receiver minimising metallic and solid objects in its line of sight. (A signal strength test can be performed following the instructions at the bottom of the troubleshooting guide).
• If the spanner symbol still shows after 5 minutes of being in close proximity to the receiver then RESET the wireless TIME:O:STAT by removing the batteries for 60 seconds and replacing.
• TIME:O:STATs are factory paired and do not require pairing. Changing the RF channel is only required if there are more than one TIME:O:STAT in close proximity. (A step by step guide to change the RF channel is available from the manuals page)

A blank screen or spanner symbol indicates the front of the TIME:O:STAT is not connected correctly to the back plate. Or a blank screen can be a result of insufficient battery level.

• Check or replace the batteries
• Ensure the TIME:O:STAT front in correctly clipped into the back plate before replacing the screw in the bottom of the unit.
• Ensure that the connecting pins between the front and back plates of the TIME:O:STAT are not bent during installation.
• If the back plate is tightly screwed to an uneven wall it can warp the back plate and pull the connecting interface pins out of alignment. This and result in the front and back plate not connecting properly. Loosening the screws connecting the back plate to the wall can rectify this.

Pressing the reset button (on the right hand side of the unit) shows the product and firmware versions.
Product t1 = Wireless
Product t2 = Mains Wired
Product t3 = Battery Wired
If you press and hold the (:t:) button whilst this is being displayed then the unit will go into an RF level evaluation mode:
Initially an LCD display test is done before going in to the RF evaluation mode
It shows the Unit’s current RF ID (00 to 15) and two numbers on the bottom of the display.
The left hand number is a measure of the RF level received by the slave from the master and the right hand number is a measure of the RF level received by the Master from the Slave. Generally, the higher the number the better, 00:00 means nothing received by the master. It is normal for these numbers to change erratically and occasionally show 00.00. A desirable signal is above 75 for both values. Below this indicates a poor signal strength.To exit this mode and return to normal operation press and hold the (:t:) button.

On Later versions of the Mark 1 there is an RF signal evaluation mode.
To access this mode, remove one of the batteries and press and hold the (:t:) button, then restore the battery.
Initially an LCD display test is done before going in to the RF evaluation mode.
The mode shows two numbers on the bottom of the display.
The Left hand number is a measure of the RF level received by the Slave from the master and the right hand number is a measure of the RF level received by the Master from the Slave. Generally, the higher the number the better, 00:00 means nothing received by the master. It is normal for these numbers to change erratically and occasionally show 00.00. A desirable signal is above 75 for both values. Below this indicates a poor signal strength.To exit this mode and return to normal operation press and hold the (:t:) button.

Changing the RF channel of the wireless TIME:O:STAT mk1 (2016-2018):

1. turn off mains power to the boiler
2. remove the batteries from the TIME:O:STAT
3. turn OFF the power to the black control unit at the adaptor plug
4. open the black cover and remove the black PAIR jumper from board
5. open the TIME:O:STAT cover
6. move the internal switch 8 up to the on position
7. turn on the power adaptor for the black unit
8. replace the batteries
9. the screen will display id00
10. use the +/- buttons to select a new channel and press the (:t:) button to set. (The screen should stop flashing)
11. remove the batteries
12. turn OFF the power adaptor from the black unit
13. move the internal switch 8 down to the OFF position
14. replace the black jumper PAIR jumper on the board in the black control unit
15. replace the black cover and turn on the power adaptor to the control unit
16. replace the batteries and the cover on the TIME:O:STAT
17. set the time 
18. turn on the mains power to the boiler.