HRT3 - Thermostat Horstmann - Free user manual and instructions
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| Product Type | Thermostat |
| Brand | Horstmann |
| Model | HRT3 |
| Power Supply | 2x AA batteries |
| Battery Life | Up to 1 year |
| Temperature Range | 5°C to 35°C |
| Display Type | LCD |
| Programming Options | 7-day programmable, up to 4 time periods per day |
| Frost Protection | Yes, adjustable |
| Override Function | Yes, temporary hold until next programmed period |
| Holiday Mode | Yes, adjustable duration |
| Dimensions (H x W x D) | 120 x 80 x 25 mm |
| Weight | 150 g |
| Mounting | Wall-mounted, surface or flush box |
| Wiring | Compatible with most heating systems (e.g., gas, electric, oil) |
| Safety Features | Low battery indicator, child lock |
| Maintenance | Wipe with a soft, dry cloth; do not use solvents |
| Spare Parts | Replacement batteries only |
| Repairability | Non-user-serviceable; contact a qualified installer |
| Warranty | 2 years |
Frequently Asked Questions - HRT3 Horstmann
How do I set the time and date on my Horstmann HRT3 thermostat?
Press and hold the Menu button for 3 seconds. Use the + and - buttons to adjust the hour, then press Next. Repeat for minutes, day, and date. Press Done to save.
How do I program a heating schedule?
Press Menu, select Schedule. Choose the day, then set up to 4 time periods (Wake, Leave, Return, Sleep). For each, set the time and desired temperature. Copy to other days if needed.
What does the override function do?
Press the Override button to temporarily change the temperature until the next programmed period. The override icon will appear on the display.
How do I set the frost protection temperature?
Go to Menu > Settings > Frost. Set the desired minimum temperature (e.g., 5°C). The thermostat will call for heat if the room drops below this.
What happens when the batteries are low?
A low battery icon will flash on the display. Replace both batteries with new AA alkaline batteries. The settings are retained during battery change if done quickly (within 30 seconds).
Can I lock the thermostat to prevent tampering?
Yes, activate child lock via Menu > Settings > Lock. Set a PIN code. To unlock, press Menu and enter the PIN.
How do I use holiday mode?
Press Menu, select Holiday. Set the duration (up to 99 days) and a target temperature (e.g., 10°C). The thermostat will maintain that temperature until the holiday ends.
Why is my thermostat not responding?
First, check the display. If blank, replace the batteries. If frozen, press the reset button (hole on the side with a paperclip). If still not working, contact support.
Can I use the HRT3 with a heat pump?
Yes, the HRT3 is compatible with most heat pump systems. However, ensure the wiring matches and consult a professional installer if unsure.
How do I clean the thermostat?
Use a soft, dry cloth to wipe the surface. Do not use water, solvents, or abrasive cleaners. Avoid spraying directly onto the device.
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