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Three Different Complaints That Sound Identical

"The temperature keeps changing" covers at least three separate faults with separate causes, and separating them before anybody is called saves a visit.

At a glance

Three complaints sound identical and are not. A brief jump when a toilet flushes is a pressure event a compensating valve exists to absorb. A slow creep hotter is the supply changing, which a pressure-balancing valve cannot correct. A scalding endpoint is the limit stop.

ShowerValve is a referral service, not a contractor. We connect homeowners with independent contractors. Contractors are required to hold whatever credential their state or municipality demands, and valve work opening a wall is often a permitted alteration — ask to see the permit. We carry out no work, we sell no valves, we do not set prices, and we never charge homeowners anything — the contractors in our network pay us when we route them a call. The maximum water temperature is set by your local code, not by this website.

Sudden, brief, tied to something else happening

A toilet flushes, a washing machine fills, somebody opens a tap, and the shower jumps for a few seconds and comes back. That is a pressure event and it is exactly what a compensating valve exists to absorb.

If it is happening badly, the question is whether the valve is doing its job — debris and scale in the balancing element are common, and that is often a cartridge rather than a valve.

Slow drift upward while you are standing in it

The shower starts right and creeps hotter over several minutes. That is usually the supply changing rather than the valve moving: hot water reaching the valve at a rising temperature as the draw continues.

On a Type P valve nothing will correct that, because a Type P is not measuring temperature. This is the complaint that most often turns out not to be a fault at all.

Different at different times of day

Hotter in the morning, milder in the evening, or the reverse. Again a supply-side story rather than a valve story — what is arriving differs, and a pressure-balancing valve preserves the balance rather than the result.

It is worth saying on a call, because a contractor who hears “it varies by time of day” is looking somewhere different from one who hears “it jumps when the toilet flushes”.

And the one that is a limit stop

If the shower can be made scalding by turning the handle to its endpoint, that is not a swing at all. That is the maximum the valve is allowed to reach, and ASSE says somebody was supposed to set it at installation.

Source: ASSE International, Adjustment of Automatic Compensating Valves to Prevent Potential Scald Hazards.

What to write down before you call

Whether it is sudden or gradual. Whether it coincides with anything else in the house. Whether it happens on every shower in the property or only one. And whether anything changed recently — a new water heater, work on the plumbing, a new appliance.

Four sentences, and they narrow the job more than an hour of diagnosis.

Ask whether it is the cartridge or the body.One is work through the trim, the other opens a wall, and the answer changes everything about the job. We will route you to somebody who covers your area, worked out from your ZIP code, and you are never charged. And if trouble elsewhere in the house needs attention, bring it up when you call.

Call (888) 752-7111