Hong Kong Emergency Repair】Hoshizaki ice machine cannot make ice? Comprehensive analysis of refrigerant/water pump failure｜Junhong Electric Professional Diagnosis

# 【Hong Kong Emergency Repair】Hoshizaki ice machine cannot make ice? Comprehensive analysis of refrigerant/water pump failure｜Junhong Electric Professional Diagnosis

During the peak season of Hong Kong's catering industry, ice machine downtime can cause thousands of dollars in losses per hour! As the first choice of star hotels and chain tea houses, Hoshizaki ice machines, if there are problems such as "normal operation but no ice production" and "abnormal ice making cycle", are often directly related to refrigerant (refrigerant) leakage or water pump failure. This article is analyzed by the Junhong Electric Engineering Team. The core cause of the failure and provide a 24-hour emergency repair plan to help you quickly restore ice production!

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## 1. 6 key failure points of Hoshizaki ice maker failure to make ice

### ❶ **Insufficient refrigerant (accounting for 42% of the failure rate)**

- **Symptoms**

✅ The compressor continues to run but the evaporator is not frosted

✅ The high and low pressure gauge values ​​are abnormal (normal value: low pressure 45-65PSI / high pressure 200-250PSI)

- **High-incidence leakage points**

▶ Condenser copper tube welding point (vibration fatigue crack)

▶ Expansion valve seal (caused by corrosion of refrigerant R404A)

- **Solution**

Using electronic leak detector + UV fluorescent agent for double positioning, vacuum filling refrigerant after precise repair (error ≤ ±5g)

### ❷ **Water inlet pump failure (accounting for 33% of the failure rate)**

- **Failure manifestation**

✅ Frequent water tank water shortage alarm (even if the water level is normal)

✅ Abnormal running sound of water pump (friction noise＞65dB)

- **Detection points**

▶ Impeller bearing wear detection (gap＞0.5mm needs to be replaced)

▶ Winding impedance test (standard value: 28-32Ω for 230V model)

- **Quick repair plan**

Hoshizaki original water pump (model: WP-1012) is available for immediate replacement

### ❸ Condenser heat dissipation is poor

- **Data indicators**

✅ When the condensing temperature is greater than 45℃, the ice-making efficiency decreases by 30%

✅ Fin spacing blockage greater than 40% will trigger high-pressure protection

- **Deep cleaning service**

Use 300W turbine air gun + food-grade cleaning agent to restore heat dissipation efficiency

### ❹ Electronic expansion valve stuck

- **Multi-engine model**

Hoshizaki KM series (using Danfoss ETS 50 valve)

- **Diagnostic process**

1. Detect the stepping voltage of the drive board (normal waveform: 5V square wave)

2. The valve body decomposes and removes oxidized carbon

### ❺ Water level sensor failure

- **Error code**

E03 (water level is too low) / E04 (water level is too high)

- **Calibration technology**

Laser level adjusts the probe height (tolerance ±1mm)

### ❻ Control motherboard abnormality

- **Common problems**

▶ Relay contact corrosion (contact resistance>0.2Ω)

▶ Electrolytic capacitor bulging (capacity attenuation>30%)

- **Junhong advantages**

Provide motherboard chip-level repair (no need to replace the entire board)

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## 2. Why choose Junhong Electric to repair Hoshizaki ice maker?

### 🔧 **Precise diagnostic system**

- American Inficon electronic leak detector (sensitivity 5g/year)

- German Testo 550 multi-function refrigerant meter set

### 🔧 **Localized service in Hong Kong**

- **Full coverage in Hong Kong**: 60 minutes fast arrival in Hong Kong Island/Kowloon/New Territories (including outlying island business districts)

- **Emergency time**: Provide emergency repairs before 2am (suitable for bars and nightclubs)

- **Price transparency**: Sign the quotation before repair, no hidden fees

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## III. 3-step emergency handling process (self-help guide before repair)

| Steps | Operation points | Risk warning |

|------|----------|----------|

| **1. Preliminary diagnosis** | Record fault code + take abnormal operation video | Self-disassembly of the control box is strictly prohibited |

| **2. Temporary response** | Turn off the power → Manually discharge residual ice → Clean the filter | Do not use chemical solvents to flush the evaporator |

| **3. Make an appointment for maintenance** | Send the model label photo (e.g. IM-100AE) via WhatsApp | Falsely reporting the model will delay maintenance |

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## 4. Professional maintenance plan to extend the life of the equipment

### 🧰 **Daily must-do**

- Check the water hardness (TDS value＞150 requires the installation of a water softener)

- Remove dust from the condenser surface

### 🧰 **Monthly focus**

- Calibrate water level sensor (test with standard measuring cup)

- Grease water pump bearing (use Molykote 111 special grease)

### 🧰 **Annual in-depth maintenance**

- Refrigerant purity test (including acidity/water/impurity analysis)

- Electrical safety test (insulation resistance ≥ 2MΩ)

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## V. Real maintenance case records

**Case 1: Hong Kong chain hot pot restaurant Hoshizaki IM-300AF stopped for no reason**

- Fault phenomenon: The display is normal but no ice is produced for 12 consecutive hours

- Junhong Testing:

1. The low pressure meter reads only 28PSI (standard value 45-65PSI)

2. Ultraviolet light detected a slight leak at the bottom of the evaporator

- Treatment plan:

✅ Repair the leak with argon arc welding

✅ Add 620g of R404A refrigerant after vacuuming

- Repair effect: Ice production is restored to 98%, and operating noise is reduced by 15dB

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**24-hour emergency support**

Call Junhong Electric immediately: +852 55311921

✅ Provide "Quote first, then repair" guarantee

✅ Commercial users enjoy 3-month parts warranty