Is HVACProSales.com an authorized MRCOOL dealer?

Yes, HVACProSales.com is an authorized MRCOOL dealer. All MRCOOL products purchased from us come with full manufacturer warranty support.

What is the MRCOOL DIY mini split?

The MRCOOL DIY mini split is a ductless air conditioning and heating system designed for homeowner installation without professional HVAC tools. It features pre-charged line sets and snap-and-click connections.

How long does shipping take for MRCOOL mini splits?

Most MRCOOL mini splits ship same-day or next business day from our warehouse. Standard delivery is 3-7 business days via freight carrier.

Do MRCOOL DIY mini splits require a professional installer?

No, the MRCOOL DIY series is specifically designed for homeowner installation. The pre-charged line sets eliminate the need for an HVAC technician with refrigerant handling certification.

What HVAC tools does HVACProSales.com carry?

HVACProSales.com carries a full range of professional HVAC tools including manifold gauge sets, refrigerant recovery machines, vacuum pumps, leak detectors, multimeters, and more from brands like Yellow Jacket, Robinair, Fieldpiece, and Fluke.

What is the best manifold gauge set for R-410A?

For R-410A work, the Yellow Jacket 49967 3-valve manifold gauge set and the Fieldpiece SM380V digital manifold are top choices among HVAC professionals. Both are available at HVACProSales.com with contractor pricing.

Do you offer contractor pricing on HVAC tools?

Yes, HVACProSales.com offers contractor pricing on all HVAC tools and equipment. Create a free account to access contractor-level discounts on manifold gauges, recovery machines, and more.

What HVAC systems does HVACProSales.com sell?

HVACProSales.com sells complete HVAC systems including ductless mini splits, central air systems, heat pumps, gas furnaces, and multi-zone systems from MRCOOL, Friedrich, and other leading brands.

What is the most energy-efficient mini split system?

The MRCOOL DIY 4th Generation mini split offers up to 22 SEER2 efficiency ratings, making it one of the most energy-efficient ductless systems available. It qualifies for federal tax credits under the Inflation Reduction Act.

P4 error - Posts - HVAC PRO Sales

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Jan 12th 2026

MRCOOL Mini Split Error Codes: E1 & P4 Troubleshooting Guide

MRCOOL Mini Split Error Codes: E1 & P4 Troubleshooting Guide MRCOOL mini-split systems have become a popular HVAC solution for homeowners and contractors alike, thanks to their energy efficiency, eas…

Published by HVACProSales Team