MECH-SG18
Generac · Guardian 22kW 22,000 Watt 200 Amp Standby Generator with Mobile Link WiFi Monitoring
Coolant leak from hoses, radiator, or water pump — causes overheating alarm (code 1400); liquid-cooled models only (Protector, larger Guardian units); check coolant level, hose connections, and look for ground stains under unit
Error MECH-SG18 on the Generac Guardian 22kW 22,000 Watt 200 Amp Standby Generator with Mobile Link WiFi Monitoring means: Coolant Leak (Liquid-Cooled). The top-ranked community fix is “Replace Faulty Coolant Hose or Water Pump” (medium difficulty, ~120 min, DIY cost: $40-$80). 2 community-ranked fixes available below.
Published February 2026 · 2 fixes · standby generator
Content is based on manufacturer service documentation, community repair experience, and OEM technical bulletins. Always verify with your owner's manual.Learn about our editorial standards.
While many standby generator repairs can be done safely at home, consider hiring a qualified technician if:
Average professional repair cost for this issue: $300-$500.
The Generac Guardian 22kW 22,000 Watt 200 Amp Standby Generator with Mobile Link WiFi Monitoring has 8 other known error codes:
Error code MECH-SG18 also appears on 2 other Generac models:
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