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HTP EL-80 - User Manual

HTP EL-80
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120 Braley Rd. P.O. Box 429 East Freetown, MA 02717-0429 www.htproducts.com
LP- 293 REV. 9.2.14
Elite
INSTALLATION
START-UP
MAINTENANCE
PARTS
Models*
EL-80 / 110 / 150 / 220 / 299 / 301 / 399
*A suffix of “LP” denotes propane gas
*A suffix of “N” denotes natural gas
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

  • L
    Laura MorrisonSep 8, 2025
    How to troubleshoot Fault Code E03 System Sensor Failure on my HTP Boiler?
    • C
      cdavenportSep 9, 2025
      If your HTP Boiler displays Fault Code E03, it means there's a system sensor failure, possibly due to an open or shorted circuit. Here’s how to troubleshoot: Disconnect the system sensor from the wiring and measure its resistance. Compare the measured resistance to the table to see if it corresponds to the sensor's temperature. If the resistance doesn't match, replace the sensor. If the sensor is OK, disconnect the sensor wiring from both the boiler and the sensor, then check continuity using an ohmmeter. Repair or replace the wiring as necessary.
  • K
    Kristin HayesAug 23, 2025
    What to do if my HTP Boiler shows Fault Code F10?
    • L
      Laura MasseyAug 25, 2025
      If your HTP Boiler displays fault code F10, it indicates the flame was lost three times during one demand call. To address this: 1. Monitor the gas pressure to the boiler during operation. 2. Make sure the flame remains stable once lit. 3. Confirm the display changes from “GAS VALVE ON” to “RUN” shortly after ignition. 4. Check the FLAME signal on the status display; it should exceed 1.0 when firing. 5. If the signal is below 1 microampere, clean the flame rectifier and spark probe. 6. If the issue continues and the ‘FLAME’ signal remains below 1.0, replace the flame probe and spark igniter probe. 7. A stable flame signal should read 5.0 to 9.0 after a minute of firing. If unsteady, inspect the burner and its sealing gaskets.
  • M
    miranda25Aug 25, 2025
    What does Fault Code F01 mean on my HTP EL-80 and how do I fix it?
    • C
      Christopher SchwartzAug 26, 2025
      If your HTP Boiler displays fault code F01, it means a safety interlock switch has tripped. Here's how to troubleshoot: 1. Check if an optional UL 353 LWCO is installed. 2. If so, see if the indicator light shows the LWCO has tripped. 3. If tripped, restore the water level and manually reset the switch and boiler. 4. If there are no optional switches, use an ohmmeter to test each standard switch after turning off the boiler and disconnecting the switch to be tested. Find the tripped switch and investigate the cause, considering that temperature switches often trip due to low water flow or poor heat transfer. 5. If no switches are tripped, push RESET on the boiler. If the F01 code returns after a short run, check the flue for blockage.
  • J
    John WilliamsAug 27, 2025
    How to fix Fault Code FLU on my HTP EL-80 Boiler?
    • H
      Heather KellerAug 27, 2025
      If your HTP Boiler is showing Fault Code FLU, it means there's excessive flue pressure. Here's how to address it: 1. Make sure that 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.
  • J
    joancoxAug 27, 2025
    What does Fault Code F00 mean on my HTP EL-80?
    • T
      Taylor LeeAug 27, 2025
      If your HTP Boiler is displaying fault code F00, it indicates the water in the boiler has overheated. Here’s how to address the issue: 1. Verify the circulator pump is functioning correctly. 2. If the pump is running, ensure there is water in the system and it's circulating properly. Check that all ball valves and zone valves are correctly opened or closed. 3. Observe the temperature/pressure gauge. If the water isn't excessively hot but the message appears, inspect the wiring to the water ECO sensor and repair if needed. If the wiring is fine and the code persists without overheating, replace the ECO sensor.
  • L
    Linda JonesNov 28, 2025
    What does Fault Code F11 on my HTP EL-80 Boiler mean?
    • M
      Matthew SchneiderDec 1, 2025
      If your HTP Boiler displays fault code F11, it indicates there's flame present when the control isn't calling for the boiler to run. Here's what to do: 1. Check for a flame through the window. If a flame is present, 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 off, replace the spark igniter and the flame rectification probe. 3. If the flame return sensor is not present after turning off the gas supply, check the gas valve electrical connection. 4. Repair the condensate system as needed. If condensate has backed up and partially filled the combustion chamber, the refractory wall may be damaged and should be replaced. 5. After taking corrective action, turn the gas ...
  • M
    Marco KellySep 18, 2025
    What does Fault Code F31 mean on my HTP Boiler?
    • K
      Katrina MccartySep 18, 2025
      If your HTP Boiler displays fault code F31, it indicates 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
    Jenna BairdSep 23, 2025
    What does Blocking Code E19 mean on my HTP Boiler?
    • T
      Terry KennedySep 23, 2025
      If your HTP Boiler displays Blocking Code E19, it means the line voltage frequency is out of range. Inspect the power wiring to the boiler and repair as necessary. If connected to line voltage, notify the power company. If connected to an alternate power source such as a generator or inverter, make sure the line voltage frequency supplied by the device is 60 Hz.
  • S
    Scott KellerSep 7, 2025
    What to do if my HTP EL-80 Boiler displays Fault Code PRO?
    • W
      William CrawfordSep 7, 2025
      If your HTP Boiler is showing Fault Code PRO, it indicates low water pressure in the boiler. To resolve this: 1. Make sure the system pressure is above 10 psig. 2. Check for leaks in the system piping.
  • D
    Daniel MillerSep 4, 2025
    What does Fault Code F13 mean on my HTP EL-80?
    • L
      lsimsSep 5, 2025
      If your HTP Boiler displays fault code F13, it indicates the fan isn't running at the commanded speed. Here's how to troubleshoot: 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 lower than 24 volts, check for excessive external loads on the boiler sensor terminals. Disconnect the 5-pin plug from the fan and check the voltage on the red wire again. If it's now between 24-40 volts, replace the fan. If it remains below 24 volts, replace the boiler control board.

HTP EL-80 Specifications

General IconGeneral
Boiler TypeCondensing
Fuel TypeNatural Gas or Propane
Input BTU80, 000
AFUE95%
Water Connection Size1" NPT
Heat Exchanger MaterialStainless Steel

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