Check who can authorise the work. A landlord, utility, council or emergency service may be the right first contact. This enquiry form is not an emergency dispatch service. Local reporting contacts are below; this enquiry service does not provide emergency dispatch.
Use the right model guidance
Quick answer
A visible pressure reading is information about the system, not a complete diagnosis. Different heating arrangements and appliances need different instructions. Use the exact manufacturer operating manual or direct professional guidance rather than applying one internet pressure target to every boiler. Do not open the casing or turn unidentified valves. If the reading is outside the stated range or a fault returns, seek appropriate assessment. Tell the business the model, displayed reading and whether the system was cold or operating when you observed it.
Sources: Vaillant: loss of boiler pressure
Record the pattern, not just one number
Note when the pressure changes, whether it falls over hours or days and whether heating has been operating. Include visible leaks, recent work and any ordinary user action already taken. Do not intentionally heat or refill a faulty system to create evidence. One reading without context can be misleading. The professional may need to compare behaviour and check the system before recommending a remedy. Keep a short dated record from safe normal observation, which is more useful than assuming the last part mentioned online is responsible.
A dated record should use the same ordinary context where possible, noting whether the system was cold or had been running. Do not manipulate equipment to make the comparison. If the professional asks for particular information, confirm how it can be obtained safely. The record supports an investigation; it does not replace the tests needed to identify the cause.
| Detail | Record without altering the system |
|---|---|
| Reading and context | Displayed value; cold or normally operating. |
| Change over time | When the reading falls or rises. |
| Related symptoms | Visible leak, warning or loss of heat. |
| Work history | Recent radiator, pipe or appliance work. |
Pressure keeps dropping
Repeated loss needs investigation rather than an indefinite cycle of topping up. The appliance, connected pipework and other system components may need assessment. A visible leak is useful information, but the absence of one does not prove there is no fault. Vaillant’s consumer guidance directs recurring concerns toward inspection of the system. Do not use a manufacturer example to diagnose another make. Ask what areas the investigation includes and how any concealed access is approved.
Useful next steps
Sources: Vaillant: loss of boiler pressure
Pressure rises or varies unusually
Tell the business how the reading changes during ordinary use and any associated noise, leak or warning. A rise may require assessment of filling arrangements, system components or the indication itself; it does not identify one guaranteed failed part. Do not drain, vent or manipulate unfamiliar valves as a generic remedy. The engineer should explain the actual finding and what operating range applies to the system. If there is an unsafe leak or other urgent sign, obtain direct help rather than waiting for a routine enquiry.
After radiator work or a recent repair
Recent changes can help the professional understand the sequence, but do not establish the cause by themselves. Provide the date, business and scope of work where known, along with any instructions left at handover. Contact the responsible business through its agreed follow-up route if appropriate. In a rental, involve the landlord or manager before authorising unrelated work. Ask how the retained and changed parts of the system will be assessed together. Avoid changing controls or filling arrangements repeatedly while different businesses investigate without shared information.
Investigation and quotation scope
Ask before approving a repair
Ask whether the visit covers the appliance alone or the heating system, what diagnostic time is included and how further work is authorised. Parts, leak tracing, access, checks and return visits can affect the total. A promise simply to restore a gauge reading is not the same as identifying recurring loss. The proposal should explain the confirmed cause, remedy and remaining uncertainty before substantial expenditure.
- What explains the change in pressure?
- Which appliance and system checks are included?
- How will extra investigation, parts and visits be approved?
Pressure history and safe follow-on assessment
Note the displayed reading, whether it changes over time and what the heating was doing when you noticed it. Provide the model and any recent servicing or work. Follow the appliance’s instructions and competent advice; do not keep topping up or adjust unfamiliar valves to gather evidence.
For an Ipswich enquiry, explain who owns or manages the equipment and whether the landlord or service provider has already been contacted. The business should assess the system before recommending parts. If replacement alters a listed building’s fabric or flue route, the property-specific permission question is separate from pressure diagnosis.
Sources: Council tenant handbook May 2025 · Listed buildings advice