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HTP MODCON1000 - User Manual

HTP MODCON1000
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120 Braley Rd. P.O. Box 429 East Freetown, MA 02717 www.htproducts.com
LP- 428 REV. 9.2.14
Mod Con
INSTALLATION
START-UP
MAINTENANCE
PARTS
Models
1000 / 1700*
*Boilers with a Suffix of HL Equipped with High and Low Gas
Pressure Switches
THIS MANUAL IS FOR USE WITH REV. 1 MOD CON 1000 and 1700 BOILERS
MANUFACTURED AFTER AUGUST 13, 2013
Heat Exchanger Bears the ASME “H” Stamp
NOTICE: HTP reserves the right to make product changes or updates without notice and will not be held liable for typographical errors
in literature.
NOTE TO CONSUMER: PLEASE KEEP ALL INSTRUCTIONS FOR FUTURE REFERENCE.
This manual must only be used by a qualified heating installer/service technician. Read all instructions in this manual before installing.
Perform steps in the order given. Failure to comply could result in substantial property damage, severe personal injury, or death.

Table of Contents

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Questions and Answers

  • Z
    Zachary GarciaSep 8, 2025
    Why is my HTP MODCON1000 showing a 'FAN SPEED ERROR F13 PUMP ON'?
    • M
      Mary GarciaSep 8, 2025
      If your HTP Boiler displays a 'FAN SPEED ERROR F13 PUMP ON' error, it means the fan isn't running at the commanded speed. Troubleshoot as follows: 1. Check the combustion air fan wiring. 2. Measure the DC voltage from the red fan wire to ground while connected to the fan. It should be between 24 to 40 volts. If it's lower than 24 volts, check for excessive external loads connected to the boiler sensor terminals.
  • S
    schroederalisonAug 23, 2025
    How to fix 'NO FLAME ON IGN F09 PUMP ON' error on HTP Boiler?
    • D
      Debra DiazAug 23, 2025
      If you're seeing a 'NO FLAME ON IGN F09 PUMP ON' error on your HTP Boiler, it means the boiler attempted to ignite four times without success. Here’s how to troubleshoot: 1. Watch the igniter through the observation window. 2. If there's no spark, check the spark electrode for a .156” (3.96 mm) gap. 3. Remove any corrosion from the spark electrode and flame rectifier probe. 4. If there is a spark but no flame, verify the gas supply to the boiler. 5. If there is a flame, check the flame sensor. 6. Inspect for any flue blockage or condensate blocks.
  • K
    Kristie FreyAug 25, 2025
    What to do if HTP MODCON1000 displays 'WATER HIGH TEMP F00 PUMP ON'?
    • E
      Eric HillAug 25, 2025
      If your HTP Boiler shows a 'WATER HIGH TEMP F00 PUMP ON' message, follow these steps: 1. Check the operation of the circulator pump. 2. If the pump is running, ensure there is water in the system and that it's circulating properly. Make sure all ball valves or zone valves are correctly opened or closed. 3. Observe the temperature/pressure gauge. If the water isn't excessively hot but the message persists, inspect the wiring to the water ECO sensor and repair if needed. If the wiring is fine and the code remains, replace the ECO sensor.
  • J
    Joshua DoyleAug 27, 2025
    Why does my HTP Boiler show 'SUPPLY TEMP HIGH F05 PUMP ON'?
    • M
      Michelle BishopAug 27, 2025
      The 'SUPPLY TEMP HIGH F05 PUMP ON' error on your HTP Boiler indicates that the supply temperature is too high. To resolve this: 1. Check the circulator pump operation. 2. Ensure adequate flow through the boiler by checking the status menu for less than a 50°F rise from the return thermistor to the supply thermistor. 3. Verify the direction of flow off the boiler circulator. 4. Troubleshoot the thermistor, checking the electrical connection to the thermistor on the outlet manifold. Verify 5 VDC by checking in Molex connector. If there is no 5 VDC, check the harness. If harness is OK, replace control. Replace thermistor if necessary.
  • S
    Samuel TorresAug 27, 2025
    How to troubleshoot flame loss (F10) on HTP Boiler?
    • V
      Vickie RossAug 28, 2025
      If your HTP Boiler is experiencing flame loss (F10), where the flame was lost while the boiler was firing 3 times during 1 demand call, consider these steps: 1. Monitor the gas pressure to the boiler during operation. 2. Make sure the flame is stable when lit. 3. Check that the display changes from “GAS VALVE ON” to “RUN” shortly after ignition. 4. Check the FLAME signal on the status display; it should be above 1.0 when firing. 5. If the signal is less than 1 microampere, clean the flame rectifier and spark probe.
  • T
    Thomas ThompsonAug 29, 2025
    What causes 'HIGH FLUE PRESS FLU PUMP ON' error in HTP MODCON1000 Boiler and how to fix it?
    • A
      allisonleeAug 29, 2025
      The 'HIGH FLUE PRESS FLU PUMP ON' error on your HTP Boiler indicates excessive flue pressure. Here’s how to address it: 1. Make sure the flue is not blocked. 2. Check the switch wiring by applying a jumper in place of the switch. If the code clears with the jumper in place, replace the flue switch and connect the wires to the new switch before running the boiler.
  • M
    Mr. Christopher GarrettSep 18, 2025
    How do I troubleshoot 'FAULT CODE EO3 System Sensor Failure' on HTP MODCON1000?
    • B
      brittany15Sep 18, 2025
      To troubleshoot the 'FAULT CODE EO3 System Sensor Failure' on your HTP Boiler: Disconnect the system sensor from the wiring and measure its resistance. Compare this measurement to the table in the manual to see if it corresponds to the sensor's temperature. If the resistance doesn't match, replace the sensor. If the sensor is okay, disconnect the sensor wiring from both the boiler and the sensor, then check for continuity using an ohmmeter. Repair or replace the wiring as needed.
  • L
    loriwongSep 22, 2025
    What does 'PROGRAM ERROR F31' mean on HTP Boiler?
    • M
      mcculloughjohnSep 22, 2025
      The 'PROGRAM ERROR F31' on your HTP Boiler indicates that there was an error while programming the control and the memory is corrupt. The control must be re-programmed. If programming does not solve the problem, the control must be replaced.
  • J
    Jerry GonzalesSep 7, 2025
    What should I do if my HTP MODCON1000 shows a 'FALSE FLAME SIG F11 PUMP ON' error?
    • B
      Bailey ScottSep 7, 2025
      If your HTP Boiler displays a 'FALSE FLAME SIG F11 PUMP ON' error, it indicates a flame is detected when the boiler isn't supposed to be running. Here’s what to do: 1. Look into the window. If there is a flame, turn off the gas supply to the boiler at the service valve and replace the gas valve. 2. If the flame signal on the status menu is greater than 1.0 when the burner is not lit, replace the spark igniter and the flame rectification probe.
  • F
    Frank ParsonsSep 4, 2025
    How to fix 'FLUE SENSOR F04 PUMP ON' error on HTP MODCON1000 Boiler?
    • B
      Brian HannaSep 4, 2025
      The 'FLUE SENSOR F04 PUMP ON' error indicates that the flue temperature sensor of your HTP Boiler has failed. To fix this: Inspect the flue sensor for physical damage or corrosion and replace it if necessary. Check the electrical connection to the flue sensor and repair as needed. Measure the resistance of the sensor and refer to the Supply Temperature Sensor chart.

HTP MODCON1000 Specifications

General IconGeneral
BrandHTP
ModelMODCON1000
CategoryBoiler
LanguageEnglish

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