Rinnai P70EV-707 HD70E Transformer - The Genuine Deal from Rinnai When your Rinnai HD70E kit just refuses to budge, no matter how hard you try to get it going - and we mean no display, no controller response, not even a peep from the ignition - the first thing a qualified engineer should be checking out is the transformer. This little component sits at the heart of things, nestled in between the 230V mains supply and the PCB, its job being to knock the mains voltage down to the low DC levels that the control board and remote controller need in order to function properly. Now, all transformer voltages on the HD70E are measured when the appliance is in standby mode, which is a Godsend for bench testing - no need to worry about it kicking in or doing some kind of nonsense. But if the transformer is on the fritz, the PCB gets no usable voltage at all. An