Compatible Models: This fuse board is compatible with for Universal H150FDN, H200FDN, H250FDN, H250FDN, H350FDN, H400FDN, H500FDN, H150FDP, H200FDP, H250FDP, H300FDP, H350FDP, H400FDP, H500FDP Professional: Designed for H Series Low NOx Pool Heaters, the replacement part number is FDXLFWP1930, this product is for heaters manufactured after September 20, 2004. If your heater model ends with FDN or this product meet your replacement needs. Note - After replacing the board, if the heater does not turn on the first time, you can turn off the gas valve and turn it back on, and the heater start working. Easy installation: The panel is completely matched with the panel that needs to be replaced. After replacement, you can get the full function of the pool heater. The installation is very simple, plug and play, and you can experience comfort. Colour:As Shown Material:FR-4 Package Contents: 1 * Panel 3 * Wiring accessories Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.