78
PHTM II
Installation, Operating & Service Instructions
110331-01 - 5/20
19 Troubleshooting (continued)
Table 19-5: Active Fault Code and Corrective Actions (continued)
Code Name Possible Causes Corrective Action
H25
E25
Hardware
Fault
Control damaged. Check control, try cycle power, replace if necessary.
H26
Calibration
Fault
Too long running without
running at minimum
capacity. Adaptation has
not been possible.
Cycle power to initiate calibration. After H24 boiler runs at
forced raised minimum modulation.
Too long running without
running at calibration
capacity appprox. 47%.
Calibration has not been
possible.
Refer to Supply High Limit (Code H04/E04) for corrective
actions. Cycle power to initiate a calibration.
H27
120 VAC
Supply Fault
120 VAC supply voltage
less than 73 VAC.
Check 120 VAC supply, correct issues as required.
H28
24 VAC
Supply Fault
Control 24 VAC wrong
frequency or high
electrical noise.
Check control, replace if necessary.
E29
Excessive
Reset
Selection
Control
!
reset button
has been selected too
often.
To clear, cycle power to control and press
!
reset button
above local display.
H30
Sequencer
Fault
[30.0] Duplicate Slave
Boiler Addresses.
Ensure each peer-to-peer boiler has a unique salve address
between 1 and 8.
[30.1] Sequencer slave
has lost communication
with Sequencer Master,
master header sensor
failure.
Check boiler to boiler connection wiring.
Check master is powered and configured.
Check header sensor wiring or configuration.
[30.2] Multiple sequencer
masters detected.
Check each boiler Lead Lag Master Enable, parameter L01,
setup. Only one boiler may be set as Sequencer Master
Enabled.
H31
Variable
Speed Pump
Fault
Variable Speed Pump
feedback fault
Check wiring to Variable Speed Pump. Defective pump
electronics or control, replace pump or control if necessary.
H32
Zone Panel
Fault
[32.0 to 32.3] Zone Panel
Communication Lost
Check wiring between panels and boiler. Check Zone Panel
Dip Switch Settings:
- Set Master/Slave Dip Switch to "Slave".
- Set ZC Dip Switch Zone Panel 1 "ZC1" to "ON".
Zone Panel 2 "ZC2" to "ON", etc.
Cycle Power.
[32.4] Zone Panel
Electronics Failure
Check following:
- Wiring Zone Panel main and daughter board.
- Power up one panel at a time to isolate problem.
- Replace panel if problem persists.
[32.5] Duplicate Zone
Panel
Check the following:
- Each ZC Dip Switch set to a unique setting: ZC1, ZC2, ZC3,
ZC4
- When multiple switches are set to "ON" the zone is reported
as panel 1.
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