What are the specs for this Control Board?

The correct replacement for ICP model YJ048G — Heat Pump Defrost Timer Board | 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 YJ048G — Heat Pump Defrost Timer Board | Ships Today.

ICP

ICP Defrost Control Board for YJ048G — Heat Pump Defrost Timer Board | Ships Today

Name: ICP Defrost Control Board for YJ048G — Heat Pump Defrost Timer Board | Ships Today
Brand: ICP
SKU: 34332101
Price: 188.50 USD
Availability: InStock

SKU: 34332101 Brand: ICP

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Overview

This is a genuine OEM defrost control board (part number 34332101) for the ICP Tempstar Heil YJ048G heat pump. The defrost board is the brains of heat-pump defrost: it monitors the defrost thermostat and an internal timer, and when frost builds on the outdoor coil in heating mode, it temporarily reverses the system into cooling, shuts off the outdoor fan, and energizes auxiliary heat so the coil clears. It also manages compressor time-delay and anti-short-cycle protection. When this board fails, the unit may ice over and lose heating capacity, fail to exit defrost, short-cycle the compressor, run the outdoor fan during defrost, or not respond to the thermostat at all. Because the board orchestrates the reversing valve, fan, and aux heat, a faulty board often imitates several other failures at once.

Specifications

Spec	Value
Part Number	34332101
Type	Defrost Control Board
Brand	ICP / Tempstar / Heil
Control Voltage	24V
Function	Defrost timing, reversing valve & aux heat control, compressor delay
Fitment	OEM Replacement
Application	Heat Pump

Compatibility

Fits the ICP Tempstar Heil YJ048G heat pump and other ICP-family outdoor units that use defrost board 34332101. Confirm the part number printed on your existing board before ordering, since defrost boards are model-specific.

Installation Guide

Safety First — Disconnect power at the disconnect and breaker, then verify zero voltage with a multimeter.
Access — Remove the condenser control-box/service panel to expose the board.
Document — Photograph every plug and wire on the board, and note connector colors and positions.
Remove — Unplug the harnesses and remove the board's mounting screws or standoffs.
Install — Mount the new board and reconnect each harness to its matching terminal per your photo; set any defrost-time jumper to match the old board.
Test — Restore power, run a heating cycle, and verify normal operation and (if possible) a forced defrost.

Signs You Need a Replacement

Outdoor coil ices over and heating output drops.
Unit gets stuck in or never enters defrost mode.
Compressor short-cycles or the outdoor fan runs during defrost.
No response to a heating call, or scorched/burnt traces on the board.

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...

$188.50

Frequently Asked Questions

Does this Control Board fit my ICP YJ048G — Heat Pump Defrost Timer Board | Ships Today?

Yes. This is the factory-specified OEM control board for the ICP YJ048G — Heat Pump Defrost Timer Board | 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 YJ048G — Heat Pump Defrost Timer Board | 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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