Platform & Control Notes
Taco, Caleffi, and Grundfos make controls, zone valves, and circulators rather than boilers, so they generally don't show standardized 'fault codes.' Symptoms there (a pump not running, a zone not calling, a relay not switching) are diagnosed by behavior, not a code. Call us and describe what's happening.
Model Families & Platforms
- Taco Circulators & Zone Controls
- Caleffi Hydronic Components & Separators
- Grundfos Alpha & MAGNA Circulators
- SpacePak Hydronic Air Handlers & Chillers
Diagnostic Characteristics & Common Service Topics
Taco, Caleffi, and Grundfos make controls, zone valves, and circulators rather than boilers, so they generally don't show standardized 'fault codes.' Symptoms there (a pump not running, a zone not calling, a relay not switching) are diagnosed by behavior, not a code. Call us and describe what's happening.
Complete Error Code Library
For the complete searchable error-code lookup table for Controls & Circulators: Taco, Caleffi, Grundfos, SpacePak equipment (including all diagnostic codes, exact lockout causes, and technician actions), visit the Phillips Hydronics Error Code Library.
Related Symptom & Diagnostic Guides
Sources & Documentation
- error-codes.json — Taco, Caleffi, and Grundfos make controls, zone valves, and circulators rather than boilers, so they generally don't show standardized 'fault codes.' Symptoms there (a pump not running, a zone not calling, a relay not switching) are diagnosed by behavior, not a code. Call us and describe what's happening.