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Glycol pressure too high
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- Check the expansion tank pressure and pre-charge level. Refill tank air to proper psi if low.
- Inspect relief valves and make sure they are operating properly at their pressure rating.
- Monitor fill valve operation and repair if stuck open and overfilling system.
- Check glycol concentration with refractometer. Dilute and adjust to proper level if too high.
- Inspect system piping and components for any restrictions or closed valves preventing flow.
- Bleed air from the system manually at high points. Trapped air causes pressure buildup.
- Verify circulating pump operation. Check for proper flow direction, speed, and no air binding.
- Clean strainers if excessive debris is causing reduced flow and overheating. Flush system if needed.
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