C-320: High steam pressure limit

Q: How do I check a C-320 fault?

1. Confirm safety valves are in service 2. Check pressure controller and switch 3. Do not adjust limit settings without authorisation Safety: Boiler work must follow site permit-to-work; never bypass safety controls.

Probable causes

Pressure control fault
Stuck modulating control
Sudden load drop

Step-by-step checks

Confirm safety valves are in service
Check pressure controller and switch
Do not adjust limit settings without authorisation

Safety: Boiler work must follow site permit-to-work; never bypass safety controls.

Sample code — verify with the OEM manual for your exact model.

Ask the expert on WhatsApp

Frequently asked questions

What does C-320 mean on a Steam Boiler?

C-320 usually indicates: High steam pressure limit. Confirm the meaning in the manufacturer's manual for your model.

What causes C-320?

Pressure control fault; Stuck modulating control; Sudden load drop.

How do I check a C-320 fault?

Work through the numbered checks above in order, recording readings as you go. Boiler work must follow site permit-to-work; never bypass safety controls.

Other Steam Boiler codes

Disclaimer: Fault code information is guidance only. Codes and meanings vary between manufacturers and models — always follow the manufacturer's manual and your site's safety procedures, and use qualified personnel for electrical, pressure, refrigerant and combustion work.