Pennco
Zone Imbalance / Zone Valve or Air Problem
Some radiators or zones heat, others stay cold
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Stuck zone valve, Air trapped in specific loop, Partially closed balancing valve, Sludge buildup in piping
How to Fix / Troubleshooting
Safety first: Piping may be hot; wear gloves.
- Check zone valves: On systems with zone valves, verify the manual levers move freely and that the valve opens when the thermostat calls.
- Bleed affected zones: Use purge valves or radiator vents on the cold zones to remove air.
- Inspect balancing valves: Ensure any balancing or isolation valves on the cold loop are fully open.
- Sludge issues: If flow remains poor, a system flush or installation of a dirt separator may be needed by a professional.
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Repair Difficulty
Medium
3/5
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