暖气供暖缺乏，是甚么问题啊？

冰雾

暖气不克不及正常供暖，喊了racv home emergency，人家反省后说是 not producing heat to the same as control panel but burner & electrical work as per normal，他不担任修。
请问这类是甚么问题啊？
持分感激！