H2
Peerless
Return Temperature Too High / Delta-T Too Low
Boiler shows H2 and may shut down intermittently during long runs
Advertisements
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.
Advertisements
Possible Causes
Short-cycling due to oversized boiler, bypass piping causing high return temp, mixing valve misadjusted
How to Fix / Troubleshooting
Safety first: Be cautious around hot water piping.
Steps:
- Check system design: Verify that any boiler bypass or primary/secondary piping is configured per Peerless installation manual.
- Adjust mixing valves: If a mixing valve is installed, ensure it is not set too high, which can raise return temperature.
- Increase flow: If possible, increase circulator speed to improve delta-T.
- Consult a professional: Persistent H2 may indicate a design issue requiring re-piping or control adjustments.
Advertisements
Repair Difficulty
Medium
3/5
Advertisements