Central Heating Leak Detection in Edinburgh

Symptoms

Because the pressure loss was inconsistent and no obvious source could be identified by sight, a full central heating leak detection process was required to locate the fault. Cases like this — where the system loses pressure without any visible wet patch or dripping — often indicate a small leak concealed behind structure or at a fitting that only releases under system pressure.

Methods Used

This combination of methods is standard practice in central heating leak detection where the leak is not immediately apparent. Each stage narrowed down the location — from identifying a damp area in the kitchen ceiling through thermal imaging, to isolating the exact fault point in the upstairs bedroom through tracer gas.

Following the repair, the system was pressure tested again to confirm no further loss.

Investigation Process

1. 1
   Initial Inspection

   The property in EH12 was inspected. Nine radiators and a combi boiler were present. No visible signs of a leak were found, making non-invasive detection methods necessary.

2. 2
   Thermal Imaging

   Thermal imaging was conducted throughout the property. A damp area was identified in the kitchen ceiling, indicating moisture within the building fabric.

3. 3
   Moisture Meter Readings

   A damp meter was used to take readings in the kitchen ceiling area. Elevated moisture levels were confirmed at the location flagged by thermal imaging.

4. 4
   Pressure Test

   A pressure test was carried out on the central heating system. The system failed, confirming an active leak was present.

5. 5
   Tracer Gas Testing

   Tracer gas was introduced to the system. A positive result was detected in the upstairs bedroom, directing attention to that area.

6. 6
   Leak Located

   Further investigation in the upstairs bedroom identified the leak at the pipe connection to a radiator. The fault was at the fitting rather than within the main pipework run.

7. 7
   Repair Carried Out

   The affected section of pipework was cut back and replaced. A new radiator blanking plug, radiator tail, and lockshield valve were installed.

8. 8
   Post-Repair Pressure Test

   The system was pressure tested again following the repair. It passed with no further pressure loss detected.

9. 9
   Recommissioning and Additional Findings

   Upon refilling and recommissioning, three radiators were found not to be heating. Inspection confirmed these radiators — in the living room and the toilet towel rail — were heavily blocked with sludge.

Result & Outcome

The sludge build-up is a separate but significant issue. It is particularly associated with microbore pipework systems and, if left untreated, will continue to restrict circulation and reduce system efficiency. A full power flush is strongly advised to address this before further damage or heating failure occurs.