What the call usually is
No heat in Seattle comes down to a short list: a flow problem the pack is protecting against, a sensor reading wrong, a relay that will not close, or an element that has leaked to ground. The meter sorts them in minutes; guessing replaces the wrong part.
The heater is the most replaced part in a Seattle hot tub and the most often replaced for no reason. Before an element is condemned we confirm flow, read both sensors, watch the heater relay pull in and measure resistance to ground — then quote.
Seattle's Cedar and Tolt water runs at about 1.5 grains of hardness with alkalinity of 15–25 ppm. Seattle water does not scale an element; it etches it. Current leaks through the thinned sheath, the GFCI trips, and the fix is a new element plus calcium in the fill so the next one lasts.
Cabinets on shaded Seattle lots stay damp from October to April. In Seattle we pull the heater housing and inspect the terminals before trusting a ground-fault reading — a damp, green connection reads like a failed element on a quick test.
What owners describe on the phone
Cold water, code on the display
OH, HL, dr, dry or a flashing temperature is the pack protecting a heater it thinks is overheating or running dry. Nine times in ten the cause is flow: filter, air lock or a lazy circ pump.
Heats, but never reaches the set point
A partly failed element, a saturated cover, or a windy lot losing heat faster than the heater adds it. Amp draw on the heater separates the three in one reading.
Breaker trips when the heater kicks on
Current leaking to ground through an etched element sheath — the classic soft-water failure. New element, and calcium in the refill.
Heater relay clicks, nothing warms
A relay with burnt contacts or a board that is not passing current. Repairable on many packs; we say which before quoting.
How the visit runs
- A call half an hour before we arrive
- Diagnosis with a meter, then one written price you approve
- Water hardness and alkalinity checked and noted
- Special-order parts arrive the next business day in most cases
- If the tub is not worth fixing, we say so
Scope, plainly: the spa and what lives inside its skirt. New circuits, supply plumbing and setting new tubs go to an electrician or a dealer.