To troubleshoot problems with radiant heating systems, check the thermostat settings, inspect for air in the system, ensure the boiler is functioning properly, verify that the pump is operational, and examine the tubing for leaks or blockages.
Radiant heating systems provide comfortable, even warmth but can develop issues over time. Whether you have electric cables or hydronic pipes, this guide will help you diagnose and fix common problems quickly.
Identify Your Radiant Heating System Type
First, determine if you have:
- Electric radiant heat: Uses heating cables or mats under floors
- Hydronic radiant heat: Circulates hot water through PEX tubing
This distinction is crucial for troubleshooting. Electric systems often have thermostat issues while hydronic systems commonly face water flow problems.
Check These Components First
Thermostat Issues
A faulty thermostat causes 40% of radiant heat failures. Test yours by:
- Turning temperature up 5°F above room temp
- Listening for a click (electric systems)
- Checking if circulator pump activates (hydronic)
Replace unresponsive thermostats. For hydronic systems, consider adding smart thermostats designed for radiant heat.
Power Supply Problems
For electric systems:
- Check circuit breakers
- Test voltage at heating mat connections
- Inspect GFCI outlets
Hydronic System Specific Fixes
Water Flow Issues
If some zones stay cold:
| Symptom | Likely Cause | Solution |
|---|---|---|
| Cold spots | Closed zone valves | Open manual valves fully |
| Gurgling sounds | Air in pipes | Bleed system at highest point |
| No heat anywhere | Pump failure | Test/replace circulator pump |
Boiler Pressure Problems
Maintain 12-25 psi for proper operation. Low pressure causes:
- Add water via fill valve
- Check for leaks in system
High pressure indicates expansion tank issues. According to U.S. Department of Energy, proper pressure maintenance improves efficiency by 15%.
Electric System Repairs
Heating Mat Failures
For cold floor sections:
- Use thermal camera to locate breaks
- Measure resistance with multimeter
- Patch small breaks with repair kit
Large damaged areas may require full replacement. Consider alternative heating options during repairs.
Floor Sensor Problems
Faulty sensors cause erratic operation. Test by:
- Comparing sensor reading to thermometer
- Checking wire connections
- Replacing if >2°F variance
When to Call a Professional
Seek expert help for:
- Major water leaks in hydronic systems
- Electrical shorts in heating mats
- Persistent pressure problems
- Boiler malfunctions
For complex hydronic systems, the Radiant Professionals Alliance recommends annual professional maintenance.
Preventative Maintenance Tips
- Flush hydronic systems every 3-5 years
- Test electric system resistance annually
- Keep boiler pressure in optimal range
- Clean filters on combi-boiler systems
