HTP MODCON1000 - User Manual

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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

Other manuals for HTP MODCON1000

Installation, Start-Up And Maintenance Instructions69 pages

Questions and Answers

A
Adrian LeeAug 21, 2025
What to do if the HTP MODCON1000 shows a 'LOW WATER LEVEL PUMP OFF LEO' error?
- W
  westcourtneyAug 22, 2025
  If the HTP Boiler displays the error 'LOW WATER LEVEL PUMP OFF LEO', it indicates a low water level in the boiler. Here's what you should do: 1. Check the boiler feed water system to ensure it's supplying make-up water. 2. Bleed all air from the system. 3. Inspect the boiler and system piping for leaks and repair them. 4. Check the low-level switch and wiring for damage and repair if needed.
A
Angela CamachoSep 2, 2025
What does 'RETURN SENSOR F03 PUMP ON' mean on my HTP Boiler?
- C
  Caroline RiveraSep 3, 2025
  The 'RETURN SENSOR F03 PUMP ON' error on your HTP Boiler indicates a failure of the return temperature sensor. To troubleshoot: 1. Check the circulator pump operation. 2. Ensure adequate flow through the boiler by accessing the status menu and confirming less than a 50°F rise from the return thermistor to the supply thermistor. 3. 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.
K
Krista AllenSep 1, 2025
How do I fix the 'SUPPLY SENSOR F02 PUMP ON' error on my HTP MODCON1000?
- S
  Sandra ComptonSep 1, 2025
  The 'SUPPLY SENSOR F02 PUMP ON' error indicates that the supply temperature sensor of your HTP Boiler has failed. To resolve this: 1. Check 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. 2. Replace the thermistor if necessary.
I
ijamesAug 30, 2025
How do I resolve the 'FLUE TEMP HIGH E07 PUMP OFF TIME' error on my HTP MODCON1000 Boiler?
- L
  lopezangelaAug 31, 2025
  The 'FLUE TEMP HIGH E07 PUMP OFF TIME' error on your HTP Boiler means the flue sensor temperature is excessively high (above 210°F). Here's what to do: Check the flue for obstructions or any signs of damage, especially from excessive heat. Repair as needed. Run the boiler and check the flue temperature using an external thermometer.
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.
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.
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.
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.
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.

HTP MODCON1000 Specifications

General

Brand	HTP
Model	MODCON1000
Category	Boiler
Language	English

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