5 Fault Finding
Malfunction | Cause | Remedy |
Water flows out of the expansion relief | Dirt on the valve seat of the expansion | Check the expansion relief valve and |
valve (only when heating up). | relief valve. | reset it manually. |
| Pressure limiting valve defective. | Switch off the boiler and immersion |
|
| heater and check whether the pressure |
|
| behind the pressure limiting valve is lower |
|
| than 3.0 bar if water flows out only when |
|
| heating up. If so, replace the pressure |
|
| limiting valve. |
| Expansion vessel defective. | Check the pressure in the expansion |
|
| vessel. If the pressure is insufficient, |
|
| |
|
| whether the equalisation tank maintains |
|
| the pressure. |
| Expansion relief valve defective. | If the pressure is normal, replace the |
|
| expansion relief valve. |
Water comes out of the temperature and | Dirt on the valve seat of the temperature | Check the seat of the temperature |
pressure relief valve (only when heating | and pressure relief valve. | and pressure relief valve and reset it |
up). |
| manually. |
| Temperature control of the boiler | Check the temperature control of the |
| defective. | boiler if water only comes out when |
|
| reheating with the boiler. Check whether |
|
| the two port valve switches to the heating |
|
| position after reaching the cylinder |
|
| temperature. |
| Cylinder temperature sensor defective. | Check the cylinder temperature sensor |
|
| and the corresponding thermal cut outs |
|
| and replace the temperature sensor and |
|
| reset the thermal cut outs if necessary. |
| Two port valve defective. | Check whether the two port valve is |
|
| working and replace it if necessary. |
| Temperature and pressure relief valve | Replace the temperature and pressure |
| defective. | relief valve if water only comes out when |
|
| heating up with the immersion heater. |
| Immersion heater defective. | Check the temperature sensor of the |
|
| immersion heater and the corresponding |
|
| thermal cut out and replace the |
|
| immersion heater if necessary. |
|
| Table 5.1 Fault Finding (continued) |
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