What are the specs for this Control Board?

The correct replacement for ICP model YJ042G2 — Heat Pump 24V | Ships Today is this exact part. It is the factory-specified replacement with exact OEM specifications. Using a part with different specifications can cause equipment damage or void your warranty. You can verify this by checking the data plate on your ICP equipment which lists the model number YJ042G2 — Heat Pump 24V | Ships Today.

ICP

ICP Defrost Control Board for YJ042G2 — Heat Pump 24V | Ships Today

Name: ICP Defrost Control Board for YJ042G2 — Heat Pump 24V | Ships Today
Brand: ICP
SKU: 34332101
Price: 168.94 USD
Availability: InStock

SKU: 34332101 Brand: ICP

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Overview

This is a genuine OEM defrost control board (Part No. 34332101) for the ICP / Tempstar / Heil YJ042G2 heat pump. The defrost board is the brain of the outdoor unit's heating cycle — it monitors the coil temperature sensor and the defrost timer, then commands the reversing valve, condenser fan, and auxiliary heat to clear frost and ice from the outdoor coil during heat-pump operation. Operating on a 24V control signal, it sequences the components so the system defrosts efficiently and returns to heating without nuisance trips. When this board fails, the outdoor coil ices over and heating efficiency collapses, the unit may run constantly in defrost, the reversing valve may not switch, or the system may stop responding to the thermostat entirely.

Specifications

Spec	Value
Part Number	34332101
Type	Defrost Control Board
Brand	ICP / Tempstar / Heil
Control Voltage	24 VAC
Application	Heat Pump Defrost Control
Fitment	OEM

Compatibility

Designed for the ICP YJ042G2 heat pump and used across the ICP brand family — Tempstar, Heil, Comfortmaker, and Arcoaire heat pumps calling for defrost board 34332101. Verify the printed part number on your existing board before ordering, as defrost boards are model-specific.

Installation Guide

Safety First — Disconnect power at the outdoor disconnect and breaker, then verify zero voltage at the board with a multimeter.
Access — Remove the condenser electrical/service panel.
Document — Photograph every wire and the defrost sensor/jumper pin positions before disconnecting.
Remove — Unplug the wire harnesses and coil sensor, then remove the mounting screws/standoffs holding the board.
Install — Mount the new board, set the defrost timer jumper to match the original, and reconnect every harness per your photo.
Test — Restore power, initiate a heating call, and confirm the board commands a normal defrost cycle and returns to heating.

Signs You Need a Replacement

Outdoor coil freezes over and heating output drops.
Unit stuck in continuous defrost or never defrosts at all.
Reversing valve fails to switch between heat and cool.
No response from the outdoor unit on a thermostat call.

Shipping & Returns

Ships same day before 3 PM CST. 30-day returns. Backed by the National HVAC Parts fitment guarantee.

Shipping Information

Orders placed before 3PM CST ship same business day
Standard delivery: 2-5 business days
Express shipping available at checkout
Free shipping on orders over $75
Tracking number emailed upon shipment

Return Policy

30-day returns on unused parts in original packaging
Electrical parts (capacitors, contactors, control boards) are final sale once installed
Email info@nationalhvacparts.com to initiate a return
Refunds processed within 5-7 business days

ICP Defrost Control Board for YJ...

$168.94

Frequently Asked Questions

Does this Control Board fit my ICP YJ042G2 — Heat Pump 24V | Ships Today?

Yes. This is the factory-specified OEM control board for the ICP YJ042G2 — Heat Pump 24V | Ships Today. It is a direct drop-in replacement that fits without modification. Always verify the model number on your equipment nameplate before ordering.

How do I replace the control board on my ICP YJ042G2 — Heat Pump 24V | Ships Today?

Difficulty: Advanced (1–2 hrs)
Step 1: Turn off breaker. Step 2: PHOTOGRAPH all wire connections before touching anything. Step 3: Label each wire with tape. Step 4: Disconnect all wires, remove old board. Step 5: Mount new board, reconnect all wires matching your photo exactly. Step 6: Restore power and test all modes. Exact part number match is critical.

My HVAC system is completely dead. What could be wrong?

Completely dead HVAC (no LED on board) = failed control board or blown fuse. Check board fuse first (3A or 5A, costs $1–$5). If fuse is good and board has power but no LED, board is dead. Always photograph wiring before replacing.

Is this control board compatible with Bryant or Payne too?

Many ICP parts are cross-compatible with Bryant and Payne since all three brands are manufactured by Carrier Global Corporation. The same physical part is often used across brand labels with different model numbers. To verify: check your Bryant or Payne equipment service manual for cross-compatible part numbers, or email info@nationalhvacparts.com with your model number.

Should I use OEM or aftermarket for my ICP control board?

OEM essential. Control boards are model-specific with precise firmware and connector layouts. Aftermarket boards rarely match all functions and can cause intermittent failures or safety issues. Always match the exact OEM part number.

How fast does National HVAC Parts ship?

Orders placed before 3:00 PM CST ship the same business day. Standard delivery is 2–5 business days anywhere in the continental United States. Express shipping available at checkout. We ship from Houston, TX to all 50 states. 30-day return policy on all parts.

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