What do H1, H2, and H3 change on the ST-504?

What do H1, H2, and H3 change on the ST-504?

H1, H2, and H3 are settings for the device’s heating function. They do not change the number of air chambers. They do not change the programmed chamber order. A warm sleeve is not proof that the air sequence is working.

Some readers search for “heat on legs for circulation.” That wording joins a device feature to a health outcome. The ST-504 page can explain the heat control and its operating boundaries. It cannot promise improved circulation for every person or choose a setting for a medical condition.

Read heat as a separate control

The controller treats heat, air compression, and vibration as separate functions. Record them separately when observing a session. “The sleeve felt warm” describes heat. “The chambers inflated from one section to another” describes air operation. “The sleeve vibrated” describes another control.

Keeping those observations separate makes support questions clearer. It also prevents a user from treating one sensation as evidence about another function.

What to check before using warmth

Read the current instruction for use first. Check the sleeve, controller, tubing, cable, and battery. The device should be dry. The sleeve should be positioned as directed. The controller should remain within reach.

Check skin sensation before and after the session. Do not use warmth to test a new symptom. Do not assume that a stronger heat level is a better choice. The manual’s temperature range and maximum limit control the operation.

Heat, clothing, and room temperature are different

A warm room changes the surrounding environment. Thick clothing changes the layer between the sleeve and skin. H1-H3 change the device setting. These are not the same factor.

When comparing sessions, keep the clothing and room conditions similar. Note the heat level, session time, sleeve position, and skin appearance. Do not describe a comfort observation as proof of a circulation change.

How to record a heat observation

Use a short equipment note after each session. Record the selected H level, the session duration, the room conditions, and the clothing layer. Note whether the warmth felt even or concentrated in one area. Note whether the sleeve moved or the controller displayed an unexpected message.

This record is useful because warmth can change with fit and surroundings. It also keeps a simple comfort note separate from a claim about circulation. If the same unusual sensation returns, stop using the heat function and take the record to support or a qualified professional.

Keep the note factual, dated, and easy for another person to review.

When warmth is no longer an ordinary feature question

Stop for pain, burning, unusual heat, new redness, a skin color change, marked numbness, worsening symptoms, smoke, visible damage, or unexpected controller behavior. Do not restart at a higher heat level to reproduce the sensation.

Use the ST-504 safety and contraindications guide when the question involves a wound, reduced sensation, a recent procedure, pregnancy, an implant, or professional guidance.

Keep pressure and vibration separate

Pressure levels describe another control. The ST-504 pressure levels guide explains L1-L3 as device labels. It does not turn a pressure number into a medical protocol.

Vibration is also separate. A vibration sensation does not prove that the air chambers are inflating. If the controller, tubing, or sleeve behaves unexpectedly, use the ST-504 troubleshooting guide rather than changing heat and pressure together.

What this page can establish

This page can explain the role of H1-H3. It can help a reader record a session in concrete terms. It cannot diagnose a circulation problem. It cannot establish that heat is suitable for a particular person. It cannot guarantee relief or recovery.

For broader product orientation, see the ST-504 complete guide. The instruction for use remains the source for buttons, limits, cleaning, and stop conditions.