Thermistor, High-Limit, Watkins No Fault Heater, Hot Spring, Tiger River, Limelight

Sku: 79005
(1 customer review)
$26.80

Replaces the obsolete 39525 and obsolete 39204

Newly designed and includes o-ring. This high-limit thermistor sensor is a safety device designed to communicate with the system to shut down the heater if the water temperature exiting your heater exceeds 118 degrees F. It simply screws into the Watkins No Fault Heater Housing (hand tight only) and then plugs directly onto the motherboard inside the IQ 2020 control box. (If your existing thermistor plugs into the side of the spa’s control box see item 78969). Always replace thermistors in pairs (ie; 79005 & 79006 OR 78970 & 78969).

Note: If you have an older style heater, these thermistor sensors might be too long. Please see item 34-01395-K

This part can be found on many Hot Spring, Limelight, Hot Spring pre 89, Tiger River models from 1994 to 2023

View Diagrams & Part Compatibility

Description

Replaces the obsolete 39525 and obsolete 39204

Newly designed and includes o-ring. This high-limit thermistor sensor is a safety device designed to communicate with the system to shut down the heater if the water temperature exiting your heater exceeds 118 degrees F. It simply screws into the Watkins No Fault Heater Housing (hand tight only) and then plugs directly onto the motherboard inside the IQ 2020 control box. (If your existing thermistor plugs into the side of the spa’s control box see item 78969). Always replace thermistors in pairs (ie; 79005 & 79006 OR 78970 & 78969).

Note: If you have an older style heater, these thermistor sensors might be too long. Please see item 34-01395-K

*If your heater looks like one of these discontinued heaters below, use 34-01395-K:
Used 1997-2003 Used 1997-2003
Hot Spring only
(No-Fault 6000)
Both Hot Spring
& Tiger River
(No-Fault 4000 & 6000)

 ALWAYS REPLACE THE THERMISTORS IN PAIRS. If a new thermistor differs in temperature sensing more than five degrees from the old thermistor, the system will go into a “fault mode” and prevent the heater, jet pump(s) and light from operating. So again, when replacing a control thermostat thermistor always replace the high limit thermistor as well and vice versa.

Thermistor Sensor Test Procedure
1. Set the meter to 20K on the OHM scale.
2. Record the temperature of the spa water.
3. Unplug the thermistor from the control box.
4. Meter across the two Thermistor leads.
5. Refer to the Temperature versus Resistance chart below to find the correct resistance value for the temperature measured. If the temperature and resistance does not match that of the chart, this test has failed and the thermistor must be replaced. Remember if the spa has been inactive, the spa water temperature may be different than the water temperature in the heater housing.

Click this chart to show the OHM range of the thermistor

View Diagrams & Part Compatibility

1 review for Thermistor, High-Limit, Watkins No Fault Heater, Hot Spring, Tiger River, Limelight

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    Kept for future use if needed. Turned out the new ones I previously purchased worked

    Employees there are very helpful

    October 12, 2023
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Ref. Diagram
# 3 PUG Control Box and Components (Hot Spring 2007 - 2009) View Diagram
# 2 Thermistors (PUG, ORCA, and EAGLE Compatible) (Hot Spring 2007 - 2018) View Diagram
# 12 ORCA Control Box and Components (Hot Spring 2009 - 2012) View Diagram
# 3 EAGLE Control Box Retrofit Upgrade (Hot Spring 2009 - 2012) View Diagram
# 8 PDR Heater (Hot Spring 2017 - 2019) View Diagram
# 6 No Fault Heater (Hot Spring 2007 - 2018) View Diagram
# 6 No Fault Heater 1997-2002 (Hot Spring 2002 - 2002) View Diagram
Control Panel 1998-2003 (Tiger River 2003 - 2003) View Diagram
# 4 Control Panel Retrofit (Tiger River 1995 - 1996) View Diagram
# 3 Control Panel Retrofit Eagle (Tiger River 1998 - 2003) View Diagram
# 11 Control Box Orca (Tiger River 2010 - 2010) View Diagram
brand model years
Hot Spring Aria (AR) 2007, 2008, 2009
Hot Spring Grandee (G) 2001, 2002, 2003, 2004, 2005, 2006, 2007
Hot Spring Grandee (GG) 2005, 2006, 2007, 2008, 2009
Hot Spring Prodigy (H) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009
Hot Spring Sovereign (I) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010
Hot Spring Sovereign (II) 2004, 2005, 2006, 2007, 2008, 2009
Hot Spring Jetsetter (J) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010
Hot Spring Jetsetter (JJ) 2006, 2007, 2008, 2009
Hot Spring Envoy (KK) 2004, 2005, 2006, 2007, 2008, 2009
Hot Spring Vista (SS) 2004, 2005, 2006, 2007, 2008, 2009
Hot Spring Vanguard (V) 2001, 2002, 2003, 2004, 2005, 2006, 2007
Hot Spring Vanguard (VV) 2005, 2006, 2007, 2008, 2009
Hot Spring Classic (F) 1994, 1995, 1996, 1997, 1998, 1999, 2000
Hot Spring Classic 230v. (FH) 1994, 1995, 1996
Hot Spring Highlife Limited Edition (ILE) 2003
Hot Spring Highlife (K) 1994, 1995, 1996
Hot Spring Landmark (S) 2001, 2002, 2003
Tiger River Caspian (CHP) 2004, 2005, 2006, 2007, 2008, 2009
Tiger River Caspian (CPN) 2003
Tiger River Siberian (L) 2001, 2002, 2003, 2004
Tiger River Manora (M) 1995, 1996
Tiger River Manora 230v. (MH) 1996
Tiger River Bengal (MM) 2005, 2006, 2007, 2008, 2009
Tiger River Sumatran (N) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009
Tiger River Tondi Round (P) 1995, 1996
Tiger River Tondi Round 230v. (PH) 1996
Limelight Flair (FLR) 2008, 2009
Limelight Glow (GLW) 2008, 2009
Limelight Pulse (PLS) 2008, 2009
Hot Spring Aria (AR) 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018
Hot Spring Aria NXT (ARN) 2022, 2023
Limelight Beam I (BMI) 2022, 2023
Limelight Beam II (BMII) 2022, 2023
Limelight Flair (FLR) 2022, 2023
Limelight Flash (FSH) 2022, 2023
Hot Spring Grandee (G) 2002, 2003, 2004, 2005, 2006, 2007
Hot Spring Grandee (GG) 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018
Hot Spring Grandee NXT (GGN) 2022, 2023
Hot Spring Prodigy (H) 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018
Hot Spring Prodigy (HN) 2022
Hot Spring Sovereign (I) 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010
Hot Spring Sovereign (II) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018
Hot Spring Sovereign (IIN) 2022, 2023
Hot Spring Jetsetter (J) 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010
Hot Spring Jetsetter (JJ) 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018
Hot Spring Jetsetter (JJN) 2022, 2023
Hot Spring Jetsetter LX (JTN) 2022, 2023
Hot Spring Envoy (KK) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018
Hot Spring Envoy NXT (KKN) 2022, 2023
Limelight Pulse (PLS) 2022, 2023
Limelight Prism (PSM) 2022, 2023
Hot Spring Vista (SS) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013
Hot Spring Triumph (TRHN) 2022
Hot Spring Vanguard (V) 2002, 2003, 2004, 2005, 2006, 2007
Hot Spring Vanguard (VV) 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018
Hot Spring Vanguard NXT (VVN) 2022
Hot Spring Classic (F) 1994, 1995, 1996, 1997, 1998, 1999, 2000
Hot Spring Classic 230v. (FH) 1994, 1995, 1996
Hot Spring Grandee (GQ) 2002
Hot Spring Prodigy (HQ) 2002
Hot Spring Highlife Limited Edition (ILE) 2003
Hot Spring Sovereign (IQ) 2002
Hot Spring Jetsetter (JQ) 2002
Hot Spring Highlife (K) 1994, 1995, 1996
Hot Spring Landmark (S) 2002, 2003
Hot Spring Landmark (SQ) 2002
Hot Spring Vanguard (VQ) 2002
Tiger River Caspian (CHP) 2004, 2005, 2006, 2007, 2008, 2009, 2010
Tiger River Caspian (CPN) 2003
Tiger River Siberian (L) 2002, 2003, 2004
Tiger River Bengal (M) 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010
Tiger River Manora 230v. (MH) 1996
Tiger River Bengal (MM) 2005, 2006, 2007, 2008, 2009, 2010
Tiger River Sumatran (N) 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010
Tiger River Tondi Round (P) 1995, 1996
Tiger River Tondi Round 230v. (PH) 1996
Limelight Bolt (BLT) 2012, 2013, 2014, 2015, 2016, 2017
Limelight Gleam (GLM) 2013, 2014, 2015, 2016, 2017
Limelight Glow (GLW) 2013, 2014, 2015, 2016, 2017
Hot Spring Aria (AR) 2009, 2010, 2011, 2012
Hot Spring Grandee (GG) 2009, 2010, 2011, 2012
Hot Spring Prodigy (H) 2009, 2010, 2011, 2012
Hot Spring Sovereign (II) 2009, 2010, 2011, 2012
Hot Spring Jetsetter (JJ) 2009, 2010, 2011, 2012
Hot Spring Envoy (KK) 2009, 2010, 2011, 2012
Hot Spring Vista (SS) 2009, 2010, 2011, 2012
Hot Spring Vanguard (VV) 2009, 2010, 2011, 2012
Tiger River Caspian (CHP) 2010
Tiger River Bengal (M) 2010
Tiger River Bengal (MM) 2010
Tiger River Sumatran (N) 2010
Limelight Bolt (BLT) 2012
Limelight Flair (FLR) 2010, 2011, 2012
Limelight Glow (GLW) 2010, 2011, 2012
Limelight Pulse (PLS) 2010, 2011, 2012
Hot Spring Aria (AR) 2012, 2013, 2014, 2015, 2016, 2017, 2018
Hot Spring Aria NXT (ARN) 2022, 2023
Limelight Beam I (BMI) 2022, 2023
Limelight Beam II (BMII) 2022, 2023
Limelight Flair (FLR) 2022, 2023
Limelight Flash (FSH) 2022, 2023
Hot Spring Grandee (GG) 2012, 2013, 2014, 2015, 2016, 2017, 2018
Hot Spring Grandee NXT (GGN) 2022, 2023
Hot Spring Prodigy (H) 2012, 2013, 2014, 2015, 2016, 2017, 2018
Hot Spring Prodigy (HN) 2022
Hot Spring Sovereign (II) 2012, 2013, 2014, 2015, 2016, 2017, 2018
Hot Spring Sovereign (IIN) 2022, 2023
Hot Spring Jetsetter (JJ) 2012, 2013, 2014, 2015, 2016, 2017, 2018
Hot Spring Jetsetter (JJN) 2022, 2023
Hot Spring Jetsetter LX (JTN) 2022, 2023
Hot Spring Envoy (KK) 2012, 2013, 2014, 2015, 2016, 2017, 2018
Hot Spring Envoy NXT (KKN) 2022, 2023
Limelight Pulse (PLS) 2022, 2023
Limelight Prism (PSM) 2022, 2023
Hot Spring Vista (SS) 2012, 2013
Hot Spring Triumph (TRHN) 2022
Hot Spring Vanguard (VV) 2012, 2013, 2014, 2015, 2016, 2017, 2018
Hot Spring Vanguard NXT (VVN) 2022
Tiger River Caspian (CHP) 2004, 2005, 2006, 2007, 2008, 2009, 2010
Tiger River Siberian (L) 1997, 1998, 1999, 2000
Tiger River Bengal (M) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010
Tiger River Sumatran (N) 1997, 1998, 1999, 2000
Limelight Bolt (BLT) 2012, 2013, 2014, 2015, 2016, 2017
Limelight Gleam (GLM) 2013, 2014, 2015, 2016, 2017
Limelight Glow (GLW) 2013, 2014, 2015, 2016, 2017
Hot Spring Aria NXT (ARN) 2022, 2023
Limelight Beam I (BMI) 2022, 2023
Limelight Beam II (BMII) 2022, 2023
Limelight Flair (FLR) 2022, 2023
Limelight Flash (FSH) 2022, 2023
Hot Spring Grandee (G) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007
Hot Spring Grandee (GG) 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018
Hot Spring Grandee NXT (GGN) 2022, 2023
Hot Spring Prodigy (H) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018
Hot Spring Prodigy (HN) 2022
Hot Spring Sovereign (I) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010
Hot Spring Sovereign (II) 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018
Hot Spring Sovereign (IIN) 2022, 2023
Hot Spring Jetsetter (J) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010
Hot Spring Jetsetter (JJ) 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018
Hot Spring Jetsetter (JJN) 2022, 2023
Hot Spring Jetsetter LX (JTN) 2022, 2023
Hot Spring Envoy (KK) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018
Hot Spring Envoy NXT (KKN) 2022, 2023
Limelight Pulse (PLS) 2022, 2023
Limelight Prism (PSM) 2022, 2023
Hot Spring Vista (SS) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013
Hot Spring Triumph (TRHN) 2022
Hot Spring Vanguard (V) 2007
Hot Spring Vanguard (VV) 2014, 2015, 2016, 2017, 2018
Hot Spring Vanguard NXT (VVN) 2022
Hot Spring Aria (AR) 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018
Hot Spring Classic (F) 1997, 1998, 1999, 2000
Hot Spring Classic 230v. (FH) 1994
Hot Spring Highlife Limited Edition (ILE) 2003
Hot Spring Highlife (K) 1995, 1996
Hot Spring Landmark (S) 1997, 1998, 1999, 2000, 2001, 2002, 2003
Tiger River Caspian (CHP) 2004, 2005, 2006, 2007, 2008, 2009, 2010
Tiger River Caspian (CPN) 2003
Tiger River Siberian (L) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004
Tiger River Bengal (M) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010
Tiger River Bengal (MM) 2005, 2006, 2007, 2008, 2009, 2010
Tiger River Sumatran (N) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010
Limelight Bolt (BLT) 2012, 2013, 2014, 2015, 2016, 2017
Limelight Gleam (GLM) 2013, 2014, 2015, 2016, 2017
Limelight Glow (GLW) 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017
Hot Spring Aria (AR) 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018
Hot Spring Grandee (G) 2003, 2004, 2005, 2006, 2007
Hot Spring Grandee (GG) 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018
Hot Spring Prodigy (H) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018
Hot Spring Highlife (Costco) (HILF) 2006
Hot Spring Sovereign (I) 2003, 2004, 2005, 2006, 2007, 2008
Hot Spring Sovereign (II) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018
Hot Spring Highlife Limited Edition (ILE) 2003
Hot Spring Jetsetter (J) 2003, 2004, 2005, 2006, 2007, 2008, 2009
Hot Spring Jetsetter (JJ) 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018
Hot Spring Envoy (KK) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018
Hot Spring Landmark (S) 2003
Hot Spring Vista (SS) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013
Hot Spring Vanguard (V) 2003, 2004, 2005, 2006, 2007
Hot Spring Vanguard (VV) 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018
Tiger River Caspian (CHP) 2005, 2006, 2007, 2008, 2009, 2010
Tiger River Bengal (M) 2005, 2006, 2007, 2008, 2009, 2010
Tiger River Bengal (MM) 2005, 2006, 2007, 2008, 2009, 2010
Tiger River Sumatran (N) 2005, 2006, 2007, 2008, 2009, 2010
Limelight Bolt (BLT) 2012, 2013, 2014, 2015, 2016, 2017
Limelight Beam I (BMI) 2018
Limelight Beam II (BMII) 2018
Limelight Flair (FLR) 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018
Limelight Flash (FSH) 2018
Limelight Gleam (GLM) 2013, 2014, 2015, 2016, 2017
Limelight Glow (GLW) 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017
Limelight Pulse (PLS) 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018
Limelight Prism (PSM) 2018
Hot Spring Grandee (G) 2002
Hot Spring Grandee (GQ) 2002
Hot Spring Prodigy (H) 2002
Hot Spring Prodigy (HQ) 2002
Hot Spring Sovereign (I) 2002
Hot Spring Sovereign Limited Edition (ILE) 2002
Hot Spring Sovereign (IQ) 2002
Hot Spring Jetsetter (J) 2002
Hot Spring Jetsetter (JQ) 2002
Hot Spring Landmark (S) 2002
Hot Spring Landmark (SQ) 2002
Hot Spring Vanguard (V) 2002
Hot Spring Vanguard (VQ) 2002
Tiger River Caspian (CHP) 2004, 2005
Tiger River Caspian (CPN) 2003
Tiger River Siberian (L) 2002, 2003, 2004
Tiger River Bengal (M) 2002, 2003, 2004, 2005
Tiger River Bengal (MM) 2005
Tiger River Sumatran (N) 2002, 2003, 2004, 2005
Tiger River Caspian (CHP) 2004, 2005, 2006, 2007, 2008, 2009, 2010
Tiger River Bengal (MM) 2005, 2006, 2007, 2008, 2009, 2010
Tiger River Caspian (CHP) 2010
Tiger River Bengal (MM) 2010
Tiger River Caspian (CPN) 2003
Tiger River Bengal (M) 2001, 2002, 2003
Tiger River Sumatran (N) 2001, 2002, 2003
Tiger River Siberian (L) 1997
Tiger River Manora (M) 1995, 1996
Tiger River Manora 230v. (MH) 1996
Tiger River Tondi Round (P) 1995, 1996
Tiger River Tondi Round 230v. (PH) 1996
Tiger River Siberian (L) 1998, 1999, 2000, 2001, 2002, 2003
Tiger River Sumatran (N) 1997, 1998, 1999, 2000, 2001, 2002, 2003
Tiger River Sumatran (N) 2010
Limelight Gleam (GLM) 2013, 2014, 2015, 2016, 2017

This chart shows the OHM range of the thermistor

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