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5.10 GRoUnDtHeRm faUlt fInDInG
Problem, No Heating
1. Check programmer calling for heating and giving output to correct pump or zone valve.
2. Check room thermostat calling for heat and giving signal to terminal 9 in Ideal unit.
3. Check correct heating pump running and not airlocked and/or zone valve opening.
4. Check ground loop pressure above zero.
5. Check ground loop pump running when on demand.
6. Check for air locks in heating system or loss of pressure.
If fault light is illuminated (amber lamp located on heat pump control panel) press the reset button to clear. (Note -
This will not reset immediately if just activated. Wait 10 minutes and try again.)
If fault light requires continuous resetting contact your installer.
Problem, no hot water DHw
1. Check programmer calling for hot water and giving output to correct pump or zone valve.
2. Check tank thermostat calling for heat and giving signal to terminal 1 in Ideal unit.
3. Check correct DhW pump running and not airlocked and/or zone valve opening.
4. Check ground loop pressure above zero.
5. Check ground loop pump running when on demand.
If fault light is illuminated (amber lamp located on heat pump control panel) press the reset button to clear. (Note -
This will not reset immediately if just activated. Wait 10 minutes and try again.)
If fault light requires continuous resetting contact your installer.
Problem, loss of performance
1. Carry out the above checks for the relevant service.
2. Where twin pump heads are used check for bypassing between pump heads/systems.
3. Where diverting valve used check for bypassing between systems.
4. Check correct flow rates for heating and hot water circuits.
5. Consider insulation issues of property.
6. Consider how system is used by tenant.
7. Consider how property is used i.e. windows and doors being left open etc.
General points
1. There can be a delay of between 3 to 10 minutes before the compressors in the units start after a demand is
made.
2. The compressors in the ground source heat pumps will cycle on and off according to the return water temperature
back to the heat pump. Return temperature achieved will depend on energy dissipated in the system. The more
energy dissipated the lower the return temperature.
3. If return temperature set point is achieved the compressors and ground loop pump will stop but the heating
circulating pumps will continue while there is a demand from either the central heating or tank thermostats and
there is a call for the service from the programmer.
4. The return temperature range available in heating mode is variable from 25°C to 55°C.
5. The return temperature in hot water mode is factory set at 65°C.
6. The Ideal machine is fitted with a "Smart Starter" (situated on electrics panel) which prevents damage to the
compressor within the heatpump. This smart starter has an LED which indicates fault conditions as follows:
Ready to accept a start command:
3 minute cycle delay:
Fault mode:
Low voltage:
26
a double blink every 5 seconds.
1 flash per second
slow flash, 5 sec on, 5 sec off.
fast flash, 10 per second.
Groundtherm - Ground Source Heat Pump -
Installation
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