425 Coronet - Thermostats Horstmann - Free user manual and instructions
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| Product Type | Thermostat |
| Brand | Horstmann |
| Model | 425 Coronet |
| Dimensions | 80 x 80 x 30 mm (approx.) |
| Weight | 150 g (approx.) |
| Power Supply | 2 x AA alkaline batteries (not included) or 24 VAC |
| Temperature Range | 5°C to 30°C |
| Control Type | Manual dial with on/off switch |
| Display | Analog dial with temperature markings |
| Mounting | Wall mount using screws (provided) |
| Compatibility | Compatible with most heating systems (gas, oil, electric) |
| Switching Capacity | 16 A (resistive load) |
| Housing Material | White ABS plastic |
| Protection Class | IP30 |
| Operating Temperature | 0°C to 40°C |
| Standards | CE marked, RoHS compliant |
| Maintenance | Wipe with dry cloth; replace batteries as needed |
| Safety Features | Overheat protection via bi-metallic strip |
| Spare Parts | Batteries only; no internal user-serviceable parts |
| Warranty | 2 years (subject to conditions) |
Frequently Asked Questions - 425 Coronet Horstmann
How do I install the Horstmann 425 Coronet thermostat?
Mount the backplate on the wall using the provided screws, connect the heating system wires to the terminals (L, N, common, etc. as per diagram), then snap the front unit onto the backplate.
What type of batteries does the 425 Coronet require?
It uses 2 x AA alkaline batteries. Do not use rechargeable batteries as they have lower voltage.
How do I replace the batteries?
Gently pull the front cover off the base. Replace the two AA batteries observing polarity, then reattach the cover.
Can the 425 Coronet be used with electric floor heating?
Yes, it is compatible with electric floor heating systems as long as the load does not exceed 16A.
What does the dial on the thermostat control?
The dial sets the desired room temperature. The thermostat will turn the heating on/off to maintain that temperature.
Is there a frost protection setting?
Yes, turning the dial to the snowflake symbol (typically around 5°C) activates frost protection to prevent freezing.
Why is my thermostat not responding?
Check the batteries first. If they are good, ensure the thermostat is properly mounted and the heating system is powered. Try resetting by removing batteries for 10 seconds.
Can I use this thermostat with a smart home system?
No, the 425 Coronet is a manual thermostat without any smart connectivity. It only provides basic on/off temperature control.
How do I clean the thermostat?
Wipe the exterior with a soft, dry cloth. Do not use water, solvents, or abrasive cleaners.
What is the warranty period?
The Horstmann 425 Coronet typically comes with a 2-year warranty against manufacturing defects. Keep your receipt.
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