Installation Manual 2013 Riv 2 27
This guide is to provide engineers a simple understanding of potential faults and how to
rectify them.
Lailey and Coates error / fault codes are listed in full on page 29 of this manual.
High Pressure fault
This Indicates that the Heat Pump system has exceeded the maximum pressures, set on
the high pressure switch.
Causes - In Heating Mode
1. This may be due to blockage within the water pipes giving poor thermal transfer
through the heat exchanger
2. Over charged with refrigerant
3. Non Condensable gas i.e. Nitrogen in the system
4. Water Flow failure
5. High on coil temperature on the indoor unit
6. Faulty pressure switch
In Defrost Mode
1. High ambient temperatures.
2. Dirty coils on the outdoor unit
3. Outdoor fan failure.
4. Non Condensable gas ie Nitrogen
5. Poor airflow on the outdoor unit ( see application guidance from the service book)
6. Over charged with refrigerant.
7. System energised faulty reversing valve
8. Faulty high pressure switch
Simple Trouble Shooting Guide
To gain access to the system parameters touch the parameters icon on the main home
screen and the enter the following code 223344, followed by enter.
Access to change system parameters
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