Lochinvar Crest Internal Fault — Main Control Board Detected an Internal Fault
Internal Fault
Main control board detected an internal fault. The main control board has detected an internal fault, so replace the main control board.
Applies to
This electronics fault code is displayed by the Crest control (text faults) on Crest with Hellcat models (FCB1000 through FCB6000), as documented in Crest with Hellcat (FCB) Service Manual, 100343237 Rev D — Table 3G fault codes (100343237 Rev D). Codes can differ between controller generations, so always check the manual that matches your unit.
- Lochinvar Crest (FB / Hellcat FCB)
- Lochinvar Crest FBN0751
- Lochinvar Crest FBN1001
- Lochinvar Crest FBN1251
- Lochinvar Crest FBN1501
- Lochinvar Crest FBN1751
- Lochinvar Crest FBN2001
- Lochinvar Crest FBN2501
- Lochinvar Crest FBN3001
- Lochinvar Crest FBN3501
- Lochinvar Crest FBN4001
- Lochinvar Crest FBN5001
- Lochinvar Crest FBN6001
- Lochinvar Crest FCB1000
- Lochinvar Crest FCB1500
- Lochinvar Crest FCB2000
- Lochinvar Crest FCB2500
- Lochinvar Crest FCB3000
- Lochinvar Crest FCB4000
- Lochinvar Crest FCB5000
- Lochinvar Crest FCB6000
Controller: Crest control (text faults). Source manual: 100343237 Rev D (2025-07).
Why a code is not a diagnosis
An electronics code points at the control board, memory or firmware. It is often triggered by poor incoming power or voltage backfeed from other wiring rather than by the appliance itself.
Safe things to observe
- Note the code and whether it appeared after electrical work or a power event.
Do not
- Do not open the control module.
- Do not repeatedly power-cycle to clear a recurring board code.
How professional service helps
- A technician checks supply voltage and grounding, follows the manual's reset sequence and replaces the module only if the code returns.
- Combustion and safety devices are verified with an analyser and the manufacturer's procedure after any repair.
Where ROMA provides on-site service
On-site service is currently offered in Greater Vancouver, BC, including Vancouver, Burnaby, Richmond, Surrey, Coquitlam, North Vancouver, West Vancouver, New Westminster, Port Coquitlam, Port Moody, Delta, Langley, Maple Ridge, Abbotsford, Chilliwack, White Rock, Pitt Meadows, Tsawwassen, Anmore, Lions Bay, Belcarra, Bowen Island, Mission. Everything else on this site is reference information you can use anywhere in Canada.
Parts and service
Parts commonly involved
These parts appear in the documented text for this alert. A code reports a condition, not a failed part — a technician confirms the cause by testing before anything is replaced.
Control board / PCB
The control board — also called the PCB, or printed circuit board — is the boiler's main computer.
What a technician checks →
Service for this alert
- Gas Boiler Repair
Licensed gas technicians from ROMA Heating & Cooling diagnose and repair residential and light-commercial gas boilers across…
Every boiler part explained — what it does, how it fails and what a technician checks.
Documented for Lochinvar Crest (FB / Hellcat FCB).
Frequently asked questions
Can I clear this code myself?
Clearing a code without fixing its cause usually just brings it back. Note the code, check the safe items on this page, then call a licensed technician. If your appliance manual describes a user reset for this exact code and it stays away, no call may be needed.
Boiler locked out? Call with the alert text ready.
The brand, model and this alert are passed along when you request service online, so the technician arrives prepared.
On-site service in Greater Vancouver, BC. ROMA lists “Open 7 days” on its site; call to confirm same-day availability.
Sources and verification
- Crest with Hellcat (FCB) Service Manual, 100343237 Rev D — Table 3G fault codes · 100343237 Rev D · accessed September 7, 2026
Facts checked September 7, 2026. Last updated September 7, 2026. Technical reviewer: not yet assigned.