HVAC HVACR Levels United LLC

10/11/2026

10/09/2026

AS requested by our subscribers. Here’s the tutorial! Enjoy and thank you for the support!

PART 1 — PUBLIC TEASER

Heat pump iced over outside, and the customer says the house never gets warm?

Before you condemn the defrost board, read this.
A defrost board only decides WHEN to defrost. It does not make heat. If the coil is a solid block of ice, the board might be bad. It might also be doing exactly what a bad system is telling it to do.

What a failing defrost board usually looks like:
• Outdoor coil builds ice and never clears
• Unit jumps into defrost every few minutes
• Defrost runs too long and the house blows cold
• Outdoor fan will not shut off in defrost, or will not restart after
• Reversing valve never shifts when defrost should start
• Board LED dead, stuck, or flashing a code that does not match the book
What it is often NOT:
• Low charge. Low refrigerant ices the coil too, but the ice pattern and pressures tell on it.
• Dirty outdoor coil or a weak outdoor fan. Airflow fails first. The board gets blamed second.
• Bad reversing valve or stuck solenoid. Board calls for defrost. Valve never moves.
• Failed defrost sensor. Board is fine. It is reading a lie.

Field trap: forcing defrost and hearing the reversing valve click does not prove the board is good. You still have to prove it terminates, the fan sequence is right, and the sensor is in range.

Teaser checks before you pull the board:
1. Confirm the unit is actually in heating, not stuck in cooling.
2. Look at WHERE the ice is. Whole coil vs bottom only vs one circuit.
3. Outdoor fan running and coil clean?
4. Sensor tight on the coil, not hanging in free air, wires not rubbed through.
5. Board has 24V. No power, no logic.

Full paid breakdown is in the subscriber post: force-defrost test, sensor ohm checks, what the outputs must do, when the board is actually the part, and the mistakes that get a new board returned.

10/03/2026

10/02/2026

⚡ 24-Volt Low Voltage Short Troubleshooting Guide

Part 1 — Free for Everyone

A 24-volt short is sneaky. Your system still “works,” but something’s off — a breaker that trips for no reason, a component that runs hot, or a battery that drains overnight. Here’s how to find it.

Step 1: Kill the power. Disconnect the battery or unplug the supply. Never probe a live 24-volt circuit — you’ll just chase ghosts.

Step 2: Visual sweep. Look for melted insulation, browned terminals, pinched wires, or corrosion on connectors. A short often leaves a mark.

Step 3: The multimeter test. Set your meter to continuity or resistance. Probe between the positive wire and ground at the load end. A reading near zero ohms means you’ve got a dead short. Infinite resistance means the wire’s clean.

Step 4: Isolate the circuit. Disconnect loads one at a time and retest. The moment resistance jumps, you’ve found the culprit branch.

Step 5: Check the obvious. Fuses, relays, and switches fail more than people think. A stuck relay contacts can short a whole circuit.
That’s the free version. It’ll get you most of the way there.

Part 2 — For Paid Subscribers Only

This is where it gets real. The free steps catch the obvious shorts. The ones that eat your weekend are the intermittent ones — the short that only shows up when the engine’s hot, or when a wire flexes over a bump.

In Part 2, I walk you through:
• Thermal imaging — finding shorts you can’t see with a multimeter
• Voltage drop testing under load — the technique that reveals high-resistance shorts hiding in plain sight
• The “wiggle test” — systematically flexing harnesses to reproduce intermittent faults
• Oscilloscope patterns — what a short looks like on a scope versus a meter
• Common 24-volt system traps — the mistakes that make you replace good parts
Want the full playbook? Subscribe to get part 2!