What are the specs for this Control Board?

The correct replacement for ICP model YK042G — Heat Pump | 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 YK042G — Heat Pump | Ships Today.

ICP

ICP Defrost Control Board for YK042G — Heat Pump | Ships Today

Name: ICP Defrost Control Board for YK042G — Heat Pump | Ships Today
Brand: ICP
SKU: 34332101
Price: 188.50 USD
Availability: InStock

SKU: 34332101 Brand: ICP

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Overview

This OEM defrost control board (part 34332101) is the brain of the defrost cycle on the ICP / Tempstar / Heil YK042G heat pump. It monitors coil temperature and run time, then commands the unit into defrost to clear frost and ice from the outdoor coil during heating season — energizing the reversing valve, pausing the outdoor fan, and timing the cycle. A failed defrost board leaves the outdoor coil to ice over, killing heating capacity, or sends the unit into endless defrost. Common failure symptoms include the outdoor unit caked in ice, no heat in cold weather, the reversing valve not shifting on schedule, blown low-voltage fuses, or no response at all from the control.

Specifications

Spec	Value
Part Number	34332101
Type	Defrost Control Board
Brand	ICP (Tempstar / Heil / Comfortmaker)
Function	Defrost timing, reversing valve & fan control
Control Voltage	24V
Fit	OEM Replacement
Application	Heat Pump

Compatibility

Direct OEM-fit replacement for the ICP / Tempstar / Heil YK042G heat pump. Defrost boards are model-specific — always match the printed part number (34332101) and connector layout on your existing board before ordering.

Installation Guide

Safety First — Disconnect power at the disconnect and breaker, then verify zero voltage with a multimeter before touching the board.
Access — Remove the condensing unit service panel to expose the control box.
Document — Photograph every harness plug, sensor lead, and jumper/dip-switch setting before disconnecting.
Remove — Unplug each connector, remove the defrost sensor lead, and unscrew the board from its standoffs.
Install — Mount the new board, match any timing jumper settings, and reconnect each plug per your photo.
Test — Restore power, run a heating call, and verify a proper timed defrost cycle and changeover.

Signs You Need a Replacement

Outdoor coil freezes over and heating capacity drops
Unit stuck in continuous defrost or never enters defrost
Reversing valve fails to shift on the defrost cycle
No response from the control or repeated blown low-voltage fuses

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 YK...

$188.50

Frequently Asked Questions

Does this Control Board fit my ICP YK042G — Heat Pump | Ships Today?

Yes. This is the factory-specified OEM control board for the ICP YK042G — Heat Pump | 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 YK042G — Heat Pump | 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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