Can't say for sure without direct examination or comparison to the sound of the pump on Day 1, but from this position afar, I don't think there's a need to stop using the machine. The sound is very much similar to the pump on my Neptune TL and a friend's Neptune frontloader ... resonating of a pump motor mounted to bottom of the machine's cabinet ... but perhaps a little louder. Unlikely there's a start relay on the pump, they're typically a shaded-pole induction motor. Your choice to call for a service appt for your peace of mind and to confirm if there is/is not a problem. Myself, I'd keep using the machine as-is until the situation gets obviously worse (because it may not) ... as in the pump either leaking or going dead. Or better, I'd break into the machine and examine the pump for evidence of a problem ... but I'm a DIYer and you may not have the ability.

" There are two issues for CFL/LED/LowVoltage apps and the rapid rise time isn't one of them. " The chopped off low voltage (TRICS do not turn on till at least 0.7 V and many closer to 1.0 V) causes heating in inductors as does the delayed turn on ad sharp steps produced in the current waveform. Even at 100% on time, the voltage loss is present on every AC cycle. The delayed turn on also produces a sharp rising edge 9and by this means a lot of harmonics of the 60 Hz). The impedance of an inductive element rises with frequency, meaning more power is dissipated in the part heating it up. It is not hard to design AC-DC power supplies to cope with TRIAC switching, but it needs to be done if the supply needs to operate correctly. CFLs have even more problems, since they both rectify the incoming power, and then use switching techniques to boost it up to many hundreds volts for starting, ad then keep it provide a lower (but still high) voltage ft operation at tens to hundreds of kilohertz frequency (instead of the power line 60 Hertz). Dimming fluorescent lights has always been a problem. Minor dimming (5 to 15) is not hard, but after that it gets worse and worse. Leakage in the off device state also can produce odd effects on electronic ballasts. They store up the small leakage charge until the voltage stored is high enough to start a strike to turn the device on. Then the power is not adequate to keep the lamp on. It appears as a quick starting flash at intervals depending the loads and leakage present. Some LED switching supplies can respond in a similar way. while others just make the LED glow dimly all the time. Switching to the trailing edge for cutting the current allows the parasitics in the circuit to limit the fall time of the current resulting in fewer harmonics being created (and less inductor heating). The problem for the consumer is that the two devices (dimmers and lighting power supplies) have NOT always moved together. A more complicated trigger circuit on a TRIAC can use the trailing edge, but they are far from trivial to design and take significantly more parts. You have to pull current out of the gate to force the shutdown (and the negative gate current can depend on the load on the TRIAC, generally unknown and changing as the light dims).

Oh do I feel for you! Years ago we lived in a home where three of us shared a driveway (horseshoe shaped). The neighbor bought himself a big ole diesel truck, every morning he'd start that puppy up and leave it running for 10 minutes. Our bedroom window faced the driveway and if the noise didn't wake you from a sound sleep the exhaust fumes certainly did! We just didn't know how to approach him without creating a huge issue. My husband wrote him a letter telling him what a terrific looking truck he'd gotten and how much he must be enjoying it...but when he started it up in the morning the exhaust pipe faced our window and would it be too much trouble for him to pull out into the road and warm it? If not, we'd be happy to help pay for the exhaust pipe to be switched to the other side facing away from us. He couldn't have been kinder in that he had no idea what a problem it had been and from then on he pulled out to the road while warming it up. Would you be able to offer a service call? I know it's extreme, but you never know if that might not get them on the ball.

Are the lights on a dimmer? It might be producing lots of powerline "hash" -- that is, radiating noise of various frequencies well into the radio frequency range back into the powerline. Presumably your cooktop is unusually sensitive to such noise. Another possibility is that the power supplies in the lights themselves are the source of the noise. Or, it could be the combination of this particular dimmer and these particular lights. If you have the lights on a dimmer, I would first try replacing the dimmer with a conventional snap switch, and see if the noise abates or disappears. If it does, try changing to a different brand or type of dimmer. If they're not on a dimmer, I'd try disconnecting all the lights from power, then adding them back in one by one, to see if any single light is the source. Line powered LED lights have switching power supplies built in, to convert 120vac (or 240vac in other countries) to the lower voltage that LEDs need. It's possible that one of your light units has defective noise filtering in its power supply. If they all make noise, it would be pretty surprising, because the page you linked to seems to say that they meet regulatory requirements. I'm not familiar with Canada's, though, so I don't know how complete their compliance is. If the easy fixes above don't work, you may be stuck with either replacing all the lights, or changing the cooktop. One possible "quick fix" before going that drastic route might be to install a noise filter. I would wire it in ahead of the lights, maybe in a cellar junction box. I've never had to do this, so I don't have a specific recommendation. However, a quick web search turned up this one, which is supposed to be wired in ahead of noisy devices when they're interfering with an X10 home automation system. Others here may have their own recommendations for noise filters. Please let us know how it goes.