33.—(1) Where a person installs a gas appliance at a time when gas is being supplied to the premises in which the appliance is installed, he shall immediately thereafter test its connection to the installation pipework to verify that it is gastight and examine the appliance and the gas fittings and other works for the supply of gas and any flue or means of ventilation to be used in connection with the appliance for the purpose of ascertaining whether –
(a)the appliance has been installed in accordance with these Regulations;
(b)the operating pressure is as recommended by the manufacturer;
(c)the appliance has been installed with due regard to any manufacturer’s instructions provided to accompany the appliance; and
(d)all gas safety controls are in proper working order.
(2) Where a person carries out such testing and examination in relation to a gas appliance and adjustments are necessary to ensure compliance with the requirements specified in paragraph (1)(a) to (d), he shall either carry out those adjustments or disconnect the appliance from the gas supply or seal off the appliance from the gas supply with an appropriate fitting.
(3) Where gas is not being supplied to any premises in which any gas appliance is installed –
(a)a person shall not subsequently permit gas to pass into the appliance unless he has caused such testing, examination and adjustment as is specified in paragraphs (1) and (2) to be carried out; and
(b)a person who subsequently provides a gas supply to those premises shall, unless he complies with sub-paragraph (a), ensure that the appliance is sealed off from the gas supply with an appropriate fitting.