1. Stop at the safety boundary
Do not bleed or refill a system if you do not understand its pressure controls or if hot water can cause injury.
2. Capture the baseline
Take one context photo, one close view and a short note describing location, date, weather, recent water use, equipment state and occupancy.
3. Track the trigger
Heating operation and system refill history.
4. Compare, do not assume
Supports this pathway
- The bottom warms while the top stays cool
- Other radiators work
- Gurgling is present
Weakens this pathway
- The entire radiator is cold
- Multiple units are affected
- The boiler reports a fault
5. Repeat only safe checks
- Compare pipe and surface temperatures
- Check system pressure only using the appliance guidance
- Record which radiators are affected
6. Decide the next step
If the pattern is active, expanding, safety-related or requires opening inaccessible construction, stop self-help testing and prepare an evidence-based handoff. A heating professional should inspect repeated air entry, pressure loss or multiple cold radiators.
7. Verify the outcome
After any action, repeat the same observation under a comparable trigger. A dry surface immediately after work is not sufficient proof when the original symptom was intermittent.
Observe→Compare triggers→Repair source→Verify outcome
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