70
PHTM II
Installation, Operating & Service Instructions
110331-01 - 5/20
19 Troubleshooting (continued)
Table 19-1: Troubleshooting with No Active Fault Code (continued)
Indication Possible Causes Corrective Action
Water Hammer
Low Water flow through plate heat
exchanger.
Remove and inspect plate heat exchanger, flush
heat exchanger if required.
Air in system piping.
Cycle power to boiler to initiate an air elimination
cycle to help remove air from boiler water.
Low system water pressure.
Check boiler water pressure, adjust feedwater as
required.
Rough ignitions
Gas pressure problem. Refer to Table 3-4 for required pressure range.
Dirty/damaged burner.
Refer to Section 18 Service and maintenance for
proper procedure to check burner. Replace if
necessary.
Dirty/damaged ignitor/flame sensor
Refer to Section 18 Service and Maintenance for
proper procedure to check ignitor/flame sensor.
• Check spark gap and ignitor/flame sensor
distance to burner. Replace if necessary.
Relief Valve
Opening
System pressure exceeds relief valve
setting.
Lower system pressure below rating of supplied
safety relief valve.
Replace standard safety relief valve with higher
rated valve up to the maximum pressure of the
heat exchanger. (50 psi)
Improperly sized expansion tank.
In the event of high CO (exceeding 200 ppm) follow below steps in specified order:
1. Confirm fuel settings (see Section 15 Start-up and Checkout)
A. Gas valve setting (1) for Natural Gas (2) for LP
B. Control fuel gas selection [A06] (0) for Natural (1) for LP
2. Perform manual calibration 5 times per Table 16-11 [A08].
3. Follow instructions in Section 18 Service and Maintenance to
A. Check burner for damage or deterioration
B. Check ignitor flame sensor distance to burner per Figure 18-3.
4. Consult manufacturer
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