Lochinvar Knight XL Louver Proving Sw — Optional Remote Proving Switch is not Making
Louver Proving Sw
Optional remote proving switch is not making. An optional remote proving switch is not making, so check the function of remote devices and check for a loose or misplaced jumper if the auxiliary proving switch is not installed. The table classifies it as Lockout (manual reset).
Applies to
This communication or network fault code is displayed by the Knight XL control (text faults) on Knight XL models (KBX0400 through KBX1000), as documented in Knight XL (KBX) Service Manual, 100383164 Rev C — Table 3-4 fault codes (100383164 Rev C). Codes can differ between controller generations, so always check the manual that matches your unit.
- Lochinvar Knight XL Commercial (KBX)
- Lochinvar Knight XL KBX0400
- Lochinvar Knight XL KBX0500
- Lochinvar Knight XL KBX0650
- Lochinvar Knight XL KBX0800
- Lochinvar Knight XL KBX1000
Controller: Knight XL control (text faults). Source manual: 100383164 Rev C (2025-10).
Why a code is not a diagnosis
A communication code involves the link between controls (cascade, remote, sensors on a bus). Another unit being off, a wiring fault or an address conflict can all produce it.
Safe things to observe
- Check that every appliance in a multi-unit plant has power.
- Report the code together with any other codes on the system.
Do not
- Do not re-address or rewire control networks yourself.
How professional service helps
- A technician verifies power, wiring and settings across the connected units.
- 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.
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
- Knight XL (KBX) Service Manual, 100383164 Rev C — Table 3-4 fault codes · 100383164 Rev C · accessed September 7, 2026
Facts checked September 7, 2026. Last updated September 7, 2026. Technical reviewer: not yet assigned.