How to Fix a Broken Oil Space Heater: A Comprehensive DIY Guide

If your oil space heater has stopped working, don’t worry – with the right troubleshooting steps and a bit of technical know-how, you can often get it back up and running in no time. In this comprehensive guide, we’ll walk you through the most common issues with oil space heaters and provide detailed, hands-on instructions on how to fix them.

Diagnosing Power Issues

One of the first things to check when your oil space heater won’t turn on is the power supply. Start by inspecting the power cord for any visible damage or loose connections. Use a multimeter to test the continuity of the cord – if it’s faulty, replace it with a new one of the same gauge, typically 16-18 AWG.

Next, test the outlet the heater is plugged into. Plug in another device to ensure the outlet is functioning correctly. If the outlet is faulty, you’ll need to have it repaired or replaced by a licensed electrician.

Addressing Thermostat Malfunctions

how to fix a broken OIl Space Heater

If the heater turns on but doesn’t heat up, the issue may be with the thermostat. You can test the thermostat by rotating the knob – you should hear a clicking sound, even with the heater unplugged. If the thermostat is not functioning properly, you’ll need to replace it.

When purchasing a new thermostat, make sure to match the specifications of the original, including the resistance (typically 10-30 kOhms) and voltage rating (typically 120 or 240 volts).

Resolving Internal Overheating

If the heater shuts off due to overheating, the internal over-temperature semi-conductor may have failed. This component is responsible for monitoring the internal temperature and shutting off the heater if it gets too hot.

You can replace the over-temperature semi-conductor with a new one, which can be found on online marketplaces like Amazon. Be sure to follow the manufacturer’s instructions carefully when replacing this component, as it’s crucial to match the temperature rating (typically 125-150 degrees Celsius).

Fixing Leaks

If your oil space heater is leaking, it’s likely due to a faulty seal or gasket. Locate the source of the leak and replace the affected component, making sure to follow the manufacturer’s reassembly instructions to ensure a proper seal.

Balancing the Radiator

If the heater is not heating evenly, it may be due to an imbalance in the radiator. You can fix this issue by bleeding the radiator, which involves releasing any excess air from the system. This can be done using a radiator key or a flathead screwdriver.


By following the steps outlined in this guide, you should be able to diagnose and fix most common issues with your oil space heater. Remember to always prioritize safety, use the appropriate tools and equipment, and follow the manufacturer’s instructions carefully. With a bit of technical know-how and some patience, you can get your heater back up and running in no time.


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