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| Coolant temperature is less than 75 oC. Exception: if the temperature at the flame monitor -G64- is greater than 70 oC, then the flame monitor -G64- is cooled for 4 minutes at the high blower speed of the combustion air blower -V6-. The auxiliary heater then restarts. |
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| The coolant expansion tank is sufficiently filled. |
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| The coolant circuit must be free of air for the auxiliary heater to heat properly. The diagnostic tester -5019- indicates air in the coolant circuit. |
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| Bleed coolant circuit every time after opening it! |
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