Thermistor, High-Limit, Hot Spring, Tiger River, Limelight

Item #: 79005
$27.74

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 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).

This part can be found on many Hot Spring, Limelight, Tiger River models from 1994 to 2022

View compatibility table & diagrams

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 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: 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.

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 compatibility table & diagrams

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 2005 - 2006) View Diagram
# 6 No Fault Heater 1997-2002 (Hot Spring 2002 - 2002) View Diagram
Control Panel 1998-2003 (Tiger River 2003 - 2003) View Diagram
# 2 Subpanel (Current) (Limelight 2013 - 2017) 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 Accolade (AC) 2005, 2006
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
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) 2017, 2018, 2019, 2020, 2021
Limelight Beam I (BMI) 2018, 2019, 2020, 2021
Limelight Beam II (BMII) 2018, 2019, 2020, 2021
Limelight Flair (FLR) 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021
Limelight Flash (FSH) 2018, 2019, 2020, 2021
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 Highlife Grandee NXT (GGN) 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021
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) 2019, 2020, 2021
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) 2019, 2020, 2021
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 (JJN) 2019, 2020, 2021
Hot Spring Highlife Jetsetter NXT (JTN) 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021
Hot Spring Envoy (KK) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018
Hot Spring Highlife Envoy NXT (KKN) 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021
Limelight Pulse (PLS) 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021
Limelight Prism (PSM) 2018, 2019, 2020, 2021
Hot Spring Vista (SS) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013
Hot Spring Triumph TRHN (TRHN) 2019, 2020, 2021
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 Highlife Vanguard NXT (VVN) 2017, 2018, 2019, 2020, 2021
Hot Spring Accolade (AC) 2005, 2006
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, 2004
Tiger River Siberian (L) 2002, 2003, 2004
Tiger River Bengal (M) 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010
Tiger River Bengal (MM) 2005, 2006, 2007, 2008, 2009, 2010
Tiger River Sumatran (N) 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) 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) 2017, 2018, 2019, 2020, 2021
Limelight Beam I (BMI) 2018, 2019, 2020, 2021
Limelight Beam II (BMII) 2018, 2019, 2020, 2021
Limelight Flair (FLR) 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021
Limelight Flash (FSH) 2018, 2019, 2020, 2021
Hot Spring Grandee (GG) 2012, 2013, 2014, 2015, 2016, 2017, 2018
Hot Spring Highlife Grandee NXT (GGN) 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021
Hot Spring Prodigy (H) 2012, 2013, 2014, 2015, 2016, 2017, 2018
Hot Spring Prodigy (HN) 2019, 2020, 2021
Hot Spring Sovereign (II) 2012, 2013, 2014, 2015, 2016, 2017, 2018
Hot Spring Sovereign (IIN) 2019, 2020, 2021
Hot Spring Jetsetter (JJ) 2012, 2013, 2014, 2015, 2016, 2017, 2018
Hot Spring Jetsetter JJN (JJN) 2019, 2020, 2021
Hot Spring Highlife Jetsetter NXT (JTN) 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021
Hot Spring Envoy (KK) 2012, 2013, 2014, 2015, 2016, 2017, 2018
Hot Spring Highlife Envoy NXT (KKN) 2014, 2015, 2016, 2017, 2018, 2019, 2020
Limelight Pulse (PLS) 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021
Limelight Prism (PSM) 2018, 2019, 2020, 2021
Hot Spring Vista (SS) 2012, 2013
Hot Spring Triumph TRHN (TRHN) 2019, 2020, 2021
Hot Spring Vanguard (VV) 2012, 2013, 2014, 2015, 2016, 2017, 2018
Hot Spring Highlife Vanguard NXT (VVN) 2017, 2018, 2019, 2020, 2021
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) 2017, 2018, 2019, 2020, 2021
Limelight Beam I (BMI) 2018, 2019, 2020, 2021
Limelight Beam II (BMII) 2018, 2019, 2020, 2021
Limelight Flair (FLR) 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021
Limelight Flash (FSH) 2018, 2019, 2020, 2021
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 Highlife Grandee NXT (GGN) 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021
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) 2019, 2020, 2021
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) 2019, 2020, 2021
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 (JJN) 2019
Hot Spring Highlife Jetsetter NXT (JTN) 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021
Hot Spring Envoy (KK) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018
Hot Spring Highlife Envoy NXT (KKN) 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021
Limelight Pulse (PLS) 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021
Limelight Prism (PSM) 2018, 2019, 2020, 2021
Hot Spring Vista (SS) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013
Hot Spring Triumph TRHN (TRHN) 2019, 2020, 2021
Hot Spring Vanguard (V) 2007
Hot Spring Vanguard (VV) 2014, 2015, 2016, 2017, 2018
Hot Spring Highlife Vanguard NXT (VVN) 2017, 2018, 2019, 2020, 2021
Hot Spring Accolade (AC) 2005, 2006
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
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 Accolade (AC) 2005, 2006
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 Highlife 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 (CPN) 2003
Tiger River Bengal (M) 2001, 2002, 2003
Tiger River Sumatran (N) 2001, 2002, 2003
Limelight Gleam (GLM) 2013, 2014, 2015, 2016, 2017

This chart shows the OHM range of the thermistor

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