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Lochinvar Boiler Error Codes

Complete error code reference for Lochinvar Knight series boilers. Need immediate help? Call our Vancouver-based technicians at 778-909-5731

Emergency Service Available
Experiencing a lockout or no heat? Our licensed technicians provide same-day service throughout Greater Vancouver.

Common Lochinvar Error Codes

LOUrgent
Lockout - System safety fault

Recommended Action:

Call technician immediately

PPImportant
Post purge - Normal operation

Recommended Action:

Monitor system

HLUrgent
High limit - Overheating detected

Recommended Action:

Call technician

LPUrgent
Low pressure switch open

Recommended Action:

Check water pressure

FLUrgent
Flame loss during operation

Recommended Action:

Call technician

IFUrgent
Ignition failure

Recommended Action:

Call technician

BLImportant
Blower issue detected

Recommended Action:

Call technician

ALImportant
Air proving switch fault

Recommended Action:

Check venting

About Lochinvar Knight Series Boilers

Lochinvar Knight series boilers are high-efficiency condensing boilers known for their reliability and advanced control systems. These boilers feature sophisticated diagnostic capabilities with clear error code displays.

Common models include the Knight, Knight XL, and Knight Wall Hung boilers. All feature stainless steel fire-tube heat exchangers and advanced combustion management.

Need Professional Lochinvar Repair?

Our Vancouver-based technicians are trained on Lochinvar systems and available for same-day emergency service.