Technical heating guide
Boiler Error-Code Guidance
Error codes are useful starting points, but the exact meaning can change by manufacturer, model, software version, and operating condition.
Safety: Do not open gas-fired equipment, alter gas settings, bypass safeties, or work inside electrical controls without the proper qualification. For a gas smell or CO alarm, leave and call the utility or 911 from outside.
Record the full information
Take a photo of the display and equipment rating plate. Record whether the fault occurs on space heat, domestic hot water, startup, or after running.
Use the exact manual
Confirm the code in the installation or service manual for the exact model. Similar-looking boilers can assign different meanings to the same code.
Do not bypass safeties
Do not jumper switches, defeat limits, alter gas settings, or repeatedly reset a fault. Send the code and model to a qualified technician.
What to send before the visit
- Clear photo of the rating plate and model number
- Photo or exact wording of any error code
- Whether the issue affects space heating, hot water, or both
- When the problem started and whether a reset temporarily restores operation
- Your city and preferred service timing
Need service? Call 647-699-2474 or use the request form. Heating Experts will confirm the diagnostic visit and review repair pricing before approved work begins.
Technical service standards
Technical resources
Understand the system before approving the repair.
Use our knowledge hub for plain-language explanations of boiler lockouts, pressure problems, hydronic flow, combustion testing, condensate faults, OEM parts, and maintenance planning.