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HVAC Water Chiller – Common Problems, Reasons & Troubleshooting on Site.

Gul Bahar Shah
  HVAC Water Chiller – Common Problems, Reasons & Troubleshooting on Site. "let's go to discuss all common topics" 👇 ❄️ 1. Chiller Not Starting 🔍 Reasons: Power supply failure Faulty control wiring Safety devices tripped (HP/LP switch) 🛠️ Troubleshooting: Check main power supply & phase sequence Inspect control circuit & fuses Reset all safety devices Verify control panel signals ❄️ 2. Chiller Not Cooling Properly 🔍 Reasons: Low refrigerant charge Dirty condenser tubes High condenser water temperature 🛠️ Troubleshooting: Check refrigerant pressure & gas level Clean condenser tubes properly Check cooling tower performance Ensure proper water flow ❄️ 3. High Discharge Pressure 🔍 Reasons: Dirty condenser Cooling tower malfunction Presence of non-condensable gases 🛠️ Troubleshooting: Clean condenser and check water quality Inspect cooling tower fan & pump Remove non-condensable gases (purging) ❄️ 4. Low Suction Pressure 🔍 Reasons: Low refrigerant ...
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HVAC Water Chiller – Common Problems, Reasons & Troubleshooting on Site.

Gul Bahar Shah

  HVAC Water Chiller – Common Problems, Reasons & Troubleshooting on Site.


"let's go to discuss all common topics" 👇

❄️ 1. Chiller Not Starting

🔍 Reasons:
Power supply failure
Faulty control wiring
Safety devices tripped (HP/LP switch)

🛠️ Troubleshooting:
Check main power supply & phase sequence
Inspect control circuit & fuses
Reset all safety devices
Verify control panel signals

❄️ 2. Chiller Not Cooling Properly

🔍 Reasons:
Low refrigerant charge
Dirty condenser tubes
High condenser water temperature

🛠️ Troubleshooting:
Check refrigerant pressure & gas level
Clean condenser tubes properly
Check cooling tower performance
Ensure proper water flow

❄️ 3. High Discharge Pressure

🔍 Reasons:
Dirty condenser
Cooling tower malfunction
Presence of non-condensable gases

🛠️ Troubleshooting:
Clean condenser and check water quality
Inspect cooling tower fan & pump
Remove non-condensable gases (purging)

❄️ 4. Low Suction Pressure

🔍 Reasons:
Low refrigerant charge
Faulty expansion valve
Clogged strainer / filter drier

🛠️ Troubleshooting:
Check and refill refrigerant
Inspect expansion valve operation
Clean or replace filter drier
Check evaporator flow

❄️ 5. Chiller Tripping on High Current

🔍 Reasons:
High head pressure overload
Compressor or pump issue
Electrical faults

🛠️ Troubleshooting:
Check compressor condition
Inspect electrical connections
Measure current & voltage
Verify cooling system load

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