HPS18BTHSTWW Refrigerator Not Cooling – What Part Fixes This Problem?
Need the replacement part? Search your model number at for guaranteed fit and fast free shipping.
Understanding the Problem
If your HPS18BTHSTWW (18 cu ft top-freezer style) refrigerator isn't maintaining proper temperatures, the issue can come from several common subsystems: airflow (fans and vents), refrigeration (compressor, start relay, sealed system), or defrost/control (thermistor, defrost components, control board). In many cases a single failed part causes the fridge to be warm while the compressor runs constantly, or causes the compressor not to run at all. A quick, safe diagnosis starts with observing behavior: is the compressor running? Is the freezer cold while the refrigerator section is warm? Do you hear fans running or any unusual noises? Those clues narrow the likely component at fault. Some repairs (evaporator fan, condenser fan, start relay, thermistor) are straightforward for a competent DIYer; sealed system and compressor problems usually require a licensed appliance/heavy HVAC technician.
Common Symptoms
Warm refrigerator compartment; freezer either warm or very cold with heavy frost; compressor not running or running constantly; unusual buzzing or clicking from the back; water leaking or pooling in the fridge or under it.
Common Causes
- Failed evaporator fan motor causing no cold air transfer from freezer to fridge
- Bad start relay/overload or failing compressor preventing proper refrigeration
- Dirty condenser coils or failed condenser fan causing overheating and poor cooling
Popular Parts That Fix This Problem
These are the most common replacement parts that fix this problem. When you're ready to order, click below to find the right part at PartsDiscount.com — just search by your appliance model number for a guaranteed fit.
Helpful Repair Tip
Listen and feel: when the compressor is running the condenser fan should spin and the compressor should vibrate slightly; if the compressor hums but won’t start, remove the start relay (unplug first) and test/replace it. If the freezer is cold but the fridge is warm, check the evaporator fan and airflow vents for frost/blockage.
Frequently Asked Questions
How do I quickly tell whether the problem is a fan, start relay, or compressor?
Start by unplugging the refrigerator and removing the back access panel (after waiting a few minutes and following safety precautions). With the fridge plugged in and running: 1) Listen — if you hear the compressor run (steady hum) and condenser fan spins, but fridge is warm, suspect sealed system or airflow. 2) If compressor clicks but won’t run and you hear a buzzing, the start relay/overload is a common fault. 3) If the compressor runs but the evaporator fan (inside freezer) is not running, you’ll have cold freezer but warm fridge — replace evaporator fan. If unsure, test the fan motors with a multimeter or swap with a known-good part.
Can I replace these parts myself and how much will it cost?
Yes — many parts (evaporator fan, condenser fan, thermistor, start relay) are user-replaceable with basic tools and a multimeter and generally cost between $20–$120 depending on part and source. Sealed-system repairs (compressor replacement, refrigerant work) require certified technicians and are often expensive; costs can run several hundred to over a thousand dollars. Always unplug the appliance before doing any electrical work and consult the model-specific service manual or OEM parts diagram for correct part numbers and safe procedures.
Real DIY Repair Stories
Be the first to share your repair story!
Share Your Repair Story
Your experience helps other homeowners fix their appliances. Tell us how it went!
Can't Fix It Yourself? Find a Local Technician
It's perfectly okay to call a professional. Some repairs require specialized tools, deep teardowns, or dealing with complex systems that are better left to the pros.
Find the Right Part for Your Appliance
Don't guess — search your exact appliance model number at PartsDiscount.com to find the correct OEM compatible replacement part. They offer fast free shipping, guaranteed fit, and thousands of parts in stock.
Your Free Parts Videos
Whether your dishwasher won't drain, your dryer stopped heating, or your fridge isn't cold, we've created simple repair guides for the most common appliance problems homeowners face. Each guide explains what's going wrong, the most likely causes, and which replacement parts fix the issue. When you're ready to order, we link directly to PartsDiscount.com where you can search by model number and get the right part shipped fast.