Quick Answer:
If a manufacturer denies coverage or warns that warranties assume a maximum household pressure, you need measured proof and prompt correction. Take and record static and peak pressure readings, lower the system pressure into the maker’s spec (many set limits at or below 80 psi), fix any causes of pressure spikes, and keep dated logs and receipts—warranty departments ask for those documents. Provide the records to the manufacturer before sending equipment in for repair or replacement.
Why This Happens
Many appliances and fixtures are tested at a specific maximum pressure. When supply pressure or pressure spikes exceed that level, seals, cartridges, relief valves and other parts can fail prematurely. Manufacturers treat excessive pressure as an installation or maintenance issue, not a defect, and may deny a warranty claim unless you can show the system was kept within specified limits.
High static pressure stresses components continuously. Short, sharp spikes can cause immediate failure even if the normal pressure looks acceptable. Both kinds of events matter—you should record steady-state values and evidence of surges. Common outcomes include damaged cartridges and valves and worn relief devices; this is why you should check for problems like High pressure breaking faucet cartridges and High pressure damaging PRV.
Step-by-Step What to Do
1. Stay calm and collect the account
- Write down when the issue began, what failed, and any unusual events (water main work, pump cycles, hammering sounds).
- Note which appliance or fixture the manufacturer cites when denying coverage.
2. Measure static pressure
- Attach a simple pressure gauge to an outdoor hose bib or an indoor test port on the main water line. Readings with no taps running are the static (steady) pressure.
- Record the reading with date, time, location, and the gauge brand or model used.
3. Capture peak and surge pressure
- Try to capture spikes by testing during likely events: when the pump cycles, when large appliances start, or when neighbors use water. A handheld gauge with a max-hold or an inexpensive pressure logger gives better proof of peaks.
- If you can’t capture spikes yourself, hire a plumber to install a temporary transducer or logger and provide a dated report.
4. Bring pressure into manufacturer specs (often ≤80 psi)
- If static or peak readings exceed the appliance’s allowed limit, install or adjust a pressure-reducing valve (PRV) to the recommended setting—many manufacturers accept 60–80 psi as safe; check the product spec.
- For recurring spikes, consider adding a pressure tank, water hammer arrestors, or a surge arrestor where appropriate.
- Make changes promptly and document each corrective action with photos, dates, and receipts.
5. Log everything and keep receipts
- Maintain a dated log that includes: who performed the reading, the device used, static and peak values, corrective actions taken, and receipts for parts or plumber visits.
- Take clear photos of gauges, PRV settings, and installed devices. Save emails and service reports from any hired professionals.
6. Present your evidence to the manufacturer
- When you contact warranty support, send the dated logs, photos, and receipts showing the pressure readings and the steps you took to correct the problem.
- Ask specifically what documentation they require for reconsideration and keep a copy of any correspondence.
What Not to Do
- Don’t rely on verbal claims for warranty—get pressure logs and keep records.
- Don’t ignore evidence of pressure spikes; they often cause intermittent failures that look like product defects.
- Don’t remove or disable safety devices (PRVs, expansion tanks, relief valves) to try to make a system “look” right for a claim.
- Don’t perform complex modifications unless you have the skills; improper changes can worsen pressure issues and void coverage further.
When to Call a Professional
- If you can’t reliably measure peak pressures or capture surges, hire a licensed plumber who can install a pressure logger and provide a report.
- If you lack a PRV or need one installed—this is a standard job for a professional.
- For repeated or severe pressure spikes, a pro can diagnose causes (well pump controls, thermal expansion, municipal supply issues) and recommend permanent fixes.
- If the manufacturer requires an expert inspection or third-party report for the warranty, use a plumber experienced with warranty documentation.
Safety Notes
- When attaching gauges or working on the main, shut off fixtures and relieve pressure before disconnecting fittings.
- Turn off electrical equipment near where you’ll be working, and keep tools and hands dry.
- Use only rated pressure devices and compatible fittings to avoid leaks or bursts.
- If you’re unsure, stop and call a professional—don’t create a flood risk trying to improvise a fix.
Common Homeowner Questions
- How low should I set a PRV? — Aim for the manufacturer’s recommended setting; many accept 60–80 psi, but confirm the exact spec for your appliance.
- Will a single high reading void a claim? — A single documented spike can affect a claim; warranty departments usually want logs showing normal operation and any corrective steps taken.
- What documents do warranty departments ask for? — Dated pressure logs (static and peak), photos of gauges and PRV settings, receipts for parts or service, and any plumber reports.
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