Coates 23000105 Q-12DS50 half inch pool heater flow switchCoates Heater 1/2" Flow Switch, Q-12DS50, 23000105 In stock$9099
Coates 23000105 Q-12DS50 half inch pool heater flow switch
Shop all Coates Heater

Coates Heater 1/2" Flow Switch, Q-12DS50, 23000105

Ask a questionMPN 23000105
$9099
In stock
Get volume pricing Request a quote

30 day returns · Easy, with prepaid labels provided

Quick overview

  • Coates part 23000105 The factory flow switch ordered by manufacturer part number.
  • Model Q-12DS50 The half inch flow switch used on Coates heaters.
  • Half inch connection A 1/2 in flow switch, so it goes into the port it was sized for.
  • A safety device The flow switch is what tells the heater there is water moving through it. Without that proof the heater should not fire at all.
  • Common no heat cause A heater that will not start when everything else looks right often has a failed or stuck flow switch.
  • Never bypass it Jumping a flow switch to get heat lets the heater run dry, which is how heat exchangers get destroyed.
Full description and specifications ↓

Need a hand?

Bilingual support from pool professionals.
(888) 751-8084CallChat with a techChatEmail usEmail

Send us a message

A pool professional will get back to you, usually the same business day.

About Coates Heater 1/2" Flow Switch, Q-12DS50, 23000105, SKU CHC-151-7562. We will include it with your message.

We use your details to answer this message and nothing else.

Frequently bought together

Current item Coates Heater 1/2" Flow Switch, Q-12DS50, 23000105
Coates Heater

1/2" Flow Switch, Q-12DS50, 23000105

$9099
Coates Electric Heater 5.5kW 240V Threaded Element with Gasket, 20005061
Coates Heater

Coates Electric Heater 5.5kW 240V Threaded Element with Gasket, 20005061

$7099
Coates High Temperature Limit Switch, 22003820
Coates Heater

Coates High Temperature Limit Switch, 22003820

$9699
Coates Split Nut Union for SHA and SHB Heaters, PVC, 1-1/2 to 2 inch, 32705010
Coates Heater

Coates Split Nut Union for SHA and SHB Heaters, PVC, 1-1/2 to 2 inch, 32705010

$1999
Coates Temperature Control Thermostat TD103-77 CPH/PHS, 22002001
Coates Heater

Coates Temperature Control Thermostat TD103-77 CPH/PHS, 22002001

$6699
Coates Heater Element 12 kW 240V, 20006009
Coates Heater

Element 12 kW 240V, 20006009

$32999
Coates 15kW Heater Element, 208V with 4 Bolt Flange and Gasket, 20006004
Coates Heater

Coates 15kW Heater Element, 208V with 4 Bolt Flange and Gasket, 20006004

$32999
Subtotal

Similar products

Other products people compare with this one.

Raypak H000025 water pressure switch for Model 5100, 6100 and 5100ti Raypak Water Pressure Switch for Model 5100, 6100, 5100ti Pool Heater, H000025$5199 Raypak 013492F switch and decal membrane kit for pool heater control panel Raypak Switch Decal Membrane Kit For Model 268A, 408A Pool Heater, 013492F$6199 Raypak 062237B genuine OEM pool heater pressure switch Raypak Genuine OEM Heater Pressure Switch, 062237B$5599 Jandy R0457502 igniter kit for JXi 200, 260 and 400 pool heaters Jandy Igniter Kit for JXi Heater Models 200/260/400, R0457502$6199 Raypak 006737F direct mount pressure switch, 1.75 psi Raypak Genuine OEM Direct Mount Pressure Switch, 1.75 psi, 006737F$4999 Jandy R0457001 pressure switch with siphon loop kit for JXi 200, 260 and 400 heaters Jandy Pressure Switch with Siphon Loop Kit for Model 200/260/400 JXi Heaters, R0457001$6399 Hayward FDXLBVS1930 blower vacuum switch for Universal H-Series Low NOx heaters Hayward Blower Vacuum Switch, FDXLBVS1930$4999 Raypak 006736F transformer 120/240/24 V for 185A, 265A, 335A and 405A pool heaters Raypak Genuine OEM Transformer for Model 185A, 265A, 335A, 405A Pool Heater, 120/240/24 V, 006736F$7299 Pentair 42001-0060S water pressure switch for MasterTemp heaters Pentair MasterTemp Water Pressure Switch, 42001-0060S$9699 Sta-Rite 42001-0053S thermistor for Max-E-Therm and MasterTemp heaters Sta-Rite Thermistor for Max-E-Therm and MasterTemp Heater Electrical System, 42001-0053S$9599
Raypak 017155F flow sensor for the E3T pool heater Raypak E3T Flow Sensor, 017155F$5499 Sta-Rite 77707-0011 blower and adapter plate gasket kit for Max-E-Therm and MasterTemp Sta-Rite Adapter Plate Gasket Kit for Max-E-Therm and MasterTemp Heater Burner System, 77707-0011$7799 Pentair 475985 ETI 400 gas shut off switch 150F replacement kit Pentair ETI 400 Gas Shut Off Switch 150F Replacement Kit, 475985$6599 Hayward IDXL2VPS1930 Low NOx air pressure switch Hayward Air Pressure Switch, Low NOx, After 09/04, IDXL2VPS1930$10299 Sta-Rite 42002-0025S Max-E-Therm automatic gas shut off switch Sta-Rite Max-E-Therm Automatic Gas Shut Off Switch, 42002-0025S$6199 Sta-Rite 42001-0063S high limit switch for Max-E-Therm SR-200, SR-333 and SR-400 heaters Sta-Rite Max-E-Therm and MasterTemp High Limit Switch, 42001-0063S$7499 Raypak H000078 low pressure switch for heat pump pool heaters Raypak Low Pressure Switch for 2350, 3350, 4350, 5350, 6350 and 8350 Heat Pumps, H000078$6799 Pentair 460745 air orifice kit for model 250 BTU heater Pentair Air Orifice Kit for Model 250 BTU Heater, 460745$6599 Raypak 009492F switch and decal membrane for pool heater control panels Raypak Genuine OEM Switch Decal, 009492F$8099 Jandy R0457503 igniter for the Hi-E2 pool heater Jandy Igniter for Hi-E2 Heater, R0457503$6999

Product details

The Coates 23000105 is the half inch flow switch, model Q-12DS50, used on Coates pool heaters.

Why the heater needs it

A flow switch is a safety interlock. It closes only when water is genuinely moving through the heater, and the control uses that as a condition of firing. That single signal is what stops the heater from putting heat into water that is not going anywhere.

When it is the fault

A heater that refuses to start with a running pump, a clean filter and open valves is a classic failed flow switch. The switch either sticks open, so the heater never sees flow, or the paddle and contacts wear until they no longer make reliably.

One thing not to do

Do not jumper the switch to force the heater on. That takes away the only thing preventing the heater from running dry, and a heat exchanger fired without flow does not survive long.

Specifications
Brand Coates
Manufacturer part number 23000105
Model Q-12DS50
Type Flow switch
Size 1/2"
Application Pool heater
Shipping weight 0.1 lb
Ships Parcel

Request a quote

Need a volume price, a freight quote, or pricing in writing before you order? We reply the same business day.

Request a quote

Customer reviews

More from Coates Heater

Coates 12411ST 11kW 240V single phase ST Series electric spa heater Coates 11kW 240V Spa Heater, Single Phase, 12411ST$96999 Coates 34836PHS-3 PHS Series 36 kW 480 V three phase electric pool heater Coates PHS Series Electric Heater 3-Phase 36kW 480V, 34836PHS-3$3,08299 Coates 32015CE CE Series 15kW 208V three phase electric pool and spa heater Coates CE Series Electric Heater, 3-Phase, 15kW, 208V, 32015CE$2,25699 Coates 20005061 threaded heating element 5.5kW 240V with gasket Coates Electric Heater 5.5kW 240V Threaded Element with Gasket, 20005061$7099 Coates 22003820 high temperature limit switch for Coates electric heaters Coates High Temperature Limit Switch, 22003820$9699 Coates 12406ST ST Series 5.5 kW electric spa heater, 240V Coates 5.5 kW ST Series Electric Spa Heater, 240V, 12406ST$93399 Coates 20006009 heater element, 12 kW 240V Coates Heater Element 12 kW 240V, 20006009$32999 Coates 32705010 split nut union in PVC for SHA and SHB heaters Coates Split Nut Union for SHA and SHB Heaters, PVC, 1-1/2 to 2 inch, 32705010$1999 Coates 22002001 temperature control thermostat TD103-77 for CPH and PHS heaters Coates Temperature Control Thermostat TD103-77 CPH/PHS, 22002001$6699 Coates electric pool and spa heater Coates Electric Pool and Spa Heater 24kW 208V Three Phase, 32024CPH$2,97399
Coates 57kW three phase 480V electric pool and spa heater Coates Electric Heater 57kW Three Phase 480V, 32857PHS$3,86399 Coates electric pool and spa heater Coates CPH Series Electric Heater 1 Phase 30kW 240V, 12430CPH$3,05999 Coates 20006004 15kW 208V heater element with 4 bolt flange and gasket Coates 15kW Heater Element, 208V with 4 Bolt Flange and Gasket, 20006004$32999

Questions and answers

What people ask about this product, answered by our pool techs.

What is the model number?
Q-12DS50. The Coates part number is 23000105.
What does a flow switch do?
It confirms that water is actually moving through the heater. The heater uses that signal as a condition of firing, so it cannot heat a static column of water.
My heater will not fire. Could this be it?
It is a common cause. If the pump is running and the filter is clean but the heater never starts, a stuck or failed flow switch is one of the first parts to test.
Can I just bypass the switch to get heat?
No. Bypassing it removes the protection that stops the heater running without flow, and running dry is what destroys a heat exchanger.
Ask your own question