This guide is for Honeywell Home T6R-HW owners who see a boiler alert on the thermostat. It follows the T6/T6R user guide and the T6R installation guide from Resideo, which makes Honeywell Home products.

What This Problem Means

The T6R-HW can show two boiler alerts. BOILER FAULT XX means the boiler reported a failure number XX, and BOILER HAS LOW WATER PRESSURE means the boiler reported low water pressure. Both are reported by the boiler, not by the thermostat.

Common Symptoms

• BOILER FAULT followed by a number on the thermostat
• BOILER HAS LOW WATER PRESSURE on the thermostat
• A boiler alert on the thermostat screen that you can dismiss or snooze

Safe Checks You Can Try

1. Note the fault number

Write down the number shown after BOILER FAULT. Resideo says it is the failure number the boiler reported, so it is the boiler’s own fault number and Resideo’s guide doesn’t list them. Your boiler’s manual is the place to look it up.

2. Contact your installer for a boiler fault

For BOILER FAULT XX, Resideo says to contact your installer. Don’t open the boiler or touch its wiring. Any work on the boiler itself must be done by a Gas Safe registered engineer.

3. Low water pressure: top up or call your installer

For BOILER HAS LOW WATER PRESSURE, Resideo says to top up the system or contact your installer. Use your boiler maker’s instructions for topping up, and if you aren’t sure how, contact your installer or a heating engineer.

4. Dismiss or snooze the alert

Once you’ve dealt with the cause, touch the alert to dismiss it, or snooze it for 7 days.

5. Boiler data on OpenTherm boilers

Resideo’s installation guide says the thermostat’s advanced menu shows “OpenTherm boiler data when available”.

Boiler alerts explained

The alert wording comes from Resideo’s T6/T6R user guide. For other alerts, see T6R-HW error messages explained.

When To Contact Support

If none of these steps fix it, contact Resideo, which makes Honeywell Home products, through Resideo’s UK site.