Your heater won’t turn on. This can feel confusing or stressful. There are some sensible first steps you can try before deciding what to do next.

Why This Situation Matters

A heater that does not run may make your home uncomfortable. It can change your daily routine and cause extra worry. In colder weather, it may also lead to other minor issues like frozen pipes or dampness if not checked.

What to Do Immediately

1. Check the thermostat — Make sure it is set to heat and the temperature is higher than the room.
2. Check power switches — Look for a power switch near the heater or on the thermostat and make sure it is on.
3. Check the circuit breaker — See if the breaker for the heating system has tripped. Resetting it can sometimes restore power.
4. Check batteries — If your thermostat uses batteries, replacing them may help.
5. Look for lights or messages — Note any error lights or messages on the thermostat or heater and write them down.
6. Try a short reset — Turn the thermostat or heater off, wait about 30 seconds, then turn it back on and wait a few minutes to see if it starts.

Things to Avoid

• Opening the unit — Do not take apart the heater or try internal repairs.
• Using flames or makeshift tools — Avoid using candles, lighters, or other open flames near the heater.
• Repeatedly flipping breakers — Do not switch the breaker on and off quickly or many times in a row.
• Blocking vents — Do not cover supply or return vents or place items directly against the heater.
• Ignoring labels and manuals — Avoid doing anything that contradicts the manufacturer’s instructions.

What to Do Next

Keep an eye on the heater for a short time after the basic checks. Note any lights, sounds, or messages and the time each problem happened. Check the manual or online support pages for your model for simple troubleshooting tips. If you rent, tell your landlord or building manager. If the issue is inconvenient but no clear danger is present, consider scheduling a service visit with a technician or the product’s support team.

When to Get Professional Help

Professional help may be appropriate if the heater still does not start after the simple checks. It may also be wise to contact a licensed HVAC technician or an electrician if the system trips breakers, makes unusual noises, or shows repeated faults. If you notice a strong or unusual smell, contacting your utility company or a trained heating professional may be appropriate. Manufacturer support or customer service can also help with persistent error messages or questions about warranties.

Quick Summary

• Check the thermostat, power, and breakers first in a calm way.
• Look for lights or messages and try a short reset before taking other steps.
• Avoid opening the heater or using open flames.
• Contact a licensed technician, electrician, or manufacturer support if the problem continues or involves safety concerns.

About the Author

Situation Guide Editorial Team

The Situation Guide editorial team writes clear, practical guides for common real-world situations. Content focuses on safe first steps, plain-language explanations, and helping readers recognise when professional help may be appropriate. This guide provides general information only and is not a substitute for personalised professional advice. Specific circumstances can vary.