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I have a Pentair MasterTemp 400 heater for my spa. Recently the heater will not fire when the eater temperature falls below the set temperature. I rebooted the system & the blower came on, but again the heater would not fire. There were no error codes on the heater's display; only the...

I have been using Chlorox Calcium Increaser. Is this product calcium chloride or calcium chloride dihydrate? I cannot find any indication on the packaging. Thank you.

ajw22: Sorry for the response relay. Yes, I have an autofill. Since my SWCG has been disconnected for several months during the winter season, I have not been checking my salt level. I've just been adding chlorine bleach as needed. However, I checked my CYA level today & it was below 20. I...

The CH in my in-ground gunnite spa has been relatively stable over the years. However, in the past few months I noticed that the reading drops from 300ppm to 250ppm weekly. All the other chemistry levels are fine. What might be causing this? I have been purchasing Calcium Hardness Increaser by...

The flame igniter in my Pentair MasterTemp 400 heater has an ohm reading of 95 ohms. According to Pentair tech support, the acceptable range is 40-75 ohms at room temperature. My question is this: Since the 95 ohm reading was taken when the air temperature was about 45F, at room temperature...

NG. Unfortunately, I can't get the blower to come on.

From what I gather, the ohms should be 40-80 ohms at room temperature. The 95 ohm reading I got was at ambient temperature of about 45F. I don't know if that would make a difference. And if so, would the cooler temps cause the ohm reading to decrease or increase? i just hate to end up replacing...

Thank you for the links. I did test the resistance across the flame sensor. It showed 95 ohms. I don't know if this is a problem since the article indicated an ideal reading of 50 ohms. If need be, I can probably remove & inspect the flame sensor if necessary. However, testing the flame sense...

I opened the Fenwal box (see below) & all connections looked clean & secure. I tested the fuse & it was fine. However, while the blower was running, the light in the box blinked a sequence of 3 several times. I thought that I had read on this forum that it might be an indication of a bad...

Thank you, Allen. Will do. In fact I read a post on this forum having the same problem. Actually, I am getting on it right now.

When I replaced the thermal regulator, I looked into the hole & it appeared that the bypass valve was in place. I will confirm this again more carefully. Since the heater blower will run for about 30 seconds but the heater doesn't fire, it seems like the igniter could be faulty. I will check to...

Several days ago I discovered that my Pentair MasterTemp 400 heater shut off before reaching the set temperature. This was the case in both the general filtration mode & the spa mode. Having had this issue before, I discovered that the thermal regulator was corroded & would not open. So I...

I will pick up a genuine thermal regulator from a trusted independent pool parts supplier today. Arguably, I could buy 3-4 of the cheap knockoffs for the price of 1 genuine regulator. But sacrificing the reliability of my spa is certainly not worth it. Thank you for your input.

That confirms my suspicion. Thank you.

I ordered a Pentair Thermal Regulator (Pentair part # 77707-0010) from Amazon for $32. I checked with my local pool supply store & was quoted a price of $125. After a quick search of other online parts suppliers, the price seemed to range between $95 & $125. Now I am a bit suspicious that...

Makes sense. Update: I removed & checked the 2 plastic tubes connected to the AFS. All was fine. I removed & cleaned the 2 electrical wire terminals on the AFS. They looked fine, but I cleaned them anyway. I removed the white plastic air input tube & inspected for any air flow obstructions...

Thank you, Allen. I am hoping the problem is the obviously-bad thermal regulator. However, I will check to be sure that the heater blower switch is not contributing to the problem.

I noticed that the heater would not fire when the water temperature fell below the set temperature in either the spa mode or the general filtration mode. In the general filtration mode, the heater blower did not even try to run & there was no error code on the heater display panel. When I select...

You described by situation perfectly. The problem was indeed a crease. Since I originally posted this concern, I spoke with a couple of cover installers. They said that wrinkles were inevitable. Your advice to have the cover cut about 1/2" narrower is worth considering. Thank you.

Thank you, Mark. I will follow up.

I have an auto cover on my spa that needs to be replaced. When the cover was installed about 7 years ago, it had a wrinkle running down the middle. I was told by the installer that the cover material would stretch out. Unfortunately, it never did. Subsequently, the material started to separate...

Matt: So sorry to bother you on vacation. I will try unplugging the spa side connector on the control panel. Have an uninterrupted good time. I will keep you posted. Kit

Matt: Here is an update. SInce I have replaced the malfunctioning SpaSide unit with the new EasyTouch Wireless Controller, I turned off the SpaSide in the menu since I would not be using it. However, in my frustration to figure out why the AUX buttons on the wireless controller would not...

Hi, Matt Well, I thought that I would take the photos of the menu on the outdoor control panel ( as you requested) before I went to bed. Everything here is identical to that on the wireless controller. But, obviously I am missing something. Kit