| 1. Uncover the air filter and the filter, being guided by the instructions provided in subsection 6.1.2 for receiving access to the valve. |
| 2. Operation of the valve can be checked by means of the thermometer and the hair dryer for hair. Install the thermometer as it is possible closer to the valve, then, accurately heat it by means of the hair dryer for hair. The valve has to remain closed at a temperature up to 38 °C, begin to open at a temperature that 38 °C to 48 °C and to open completely at a temperature of 48 °C. Let's the valve cool down and check that it was completely closed. |
| 3. If the valve does not open at the specified temperatures or is not closed, it needs to be replaced. |
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