PENTAIR MASTERTEMP 250 HEATER CLICKING BUT Not Lighting
| CONF | DIAGNOSIS | ACTION |
|---|---|---|
|
93%
CONF
|
Hot Surface Igniter (HSI)
This is the primary ignition source. Over time, the silicon carbide element develops microscopic cracks from repeated expansion and contraction, preventing it from reaching the necessary temperature to ignite the gas despite the control board 'clicking' the relay to provide power.
SKU: 77707-0054
|
|
|
4%
CONF
|
Gas Valve (Natural Gas/Propane)
If the igniter is glowing but the heater still fails to light, the clicking may be the internal solenoid attempting to open. If the valve's internal diaphragm is stuck or the solenoid coil has failed, gas will not flow into the combustion chamber.
SKU: 42001-0051S
|
|
|
3%
CONF
|
Ignition Control Module (Fenwal)
The Fenwal board manages the ignition sequence and flame rectification. While it may click to signal the start of the ignition trial, a failure in its internal circuitry can prevent it from delivering sufficient voltage to the igniter or properly sensing the resulting flame.
SKU: 42001-0052S
|
DIY Repair Guide
Watch exactly how to replace the Hot Surface Igniter (HSI).
// NOTICE:
This report is generated by an Agentic AI Engineer utilizing probabilistic modeling.
PartSniper is an automated parts recommender service. AI-generated results may not be correct. This data is not a substitute for professional engineering advice or manual inspection. Always verify part compatibility and disconnect power before any repair. PartSniper is not liable for inaccuracies, injury, or damage.